Consider the payment methods that Patreon does cover. Money launder would be hard to pull off, as you would need so many accounts/cards to pull it through. I would like to see you manage to funnel 10k through patreon a month with what options they give. What he pull off on his alternative payment, idk. But that isn't tracked through Patreon either though.
Money launder works where physical money changes hand. The name itself have its origin in laundromats after all. Using money with digital footprint to launder money is silly and services such as resturants and similar work great. Of more recent I read about, inflate gym memberships etc. The people GD would require to have involved in such through Patreon would be ludacris.
At best he deceived and lied to people about progress and release dates of his game. Of which is not a crime, what is more criminal in that regard is people supporting him. But seeing the great flux in his numbers, the chance of he got a long term fan base of any size left supporting him is rather slim. He said before, (several times), that if people sick of waiting for a update, they should stop pledge to him. Kinda in line with the "don't push the red button". If people still do, that is on them right? It's not like he begging people to support him. Heck, if you look at that Harry potter game or what it's called on this site. The dev there almost held players ransom and said he wouldn't update it if he didn't get x amount.
Call out people for what they actually are and do should be plenty without apply all kinda unproven stuff on top. It just make people look toxic.
Also for anyone interested in how Patreon handles Money laundering, as a lot of people have never actually seen this side of things),
As someone who has used Patreon's system as a content creator and has had money flagged up 'due to it being possibly money laundering', here's how it works.
The algorithm works by quantity X time, for example, if someone was to 'donate' three thousand dollars straight up the money would be suspended and you talk to a Patreon staff member via email to explain the situation. You present your case and evidence and once you pass that you get to withdraw your money.
For me, and my work on Taffy Tales especially, this is a pain in the ass as I just use it as a portal payment for some content creators.
But, for people actually trying to launder money, it's a good barrier for large scale laundering...Though every system has cracks if you know what to look for.
There are two ways money launders could exploit the Patreon system from what I've deduced.
1.) The obvious way. Multiple small payments across a long period of time, the algorithm simply won't pick up on lots of small donations from everywhere. (Though this would be an absolute nightmare with the number of bank cards needed to do on a large scale like this).
2.) Goes back to the quantity X algorithm I mentioned earlier, once someone submits and 'proves' their claim is legitimate, the algorithm won't pick up on it if it is left as a repeatable monthly payment after the approval. For example, if someone is donating 1-3K thousand dollars a month, as long as the Patron doesn't alter their payment plan and has passed the censor, the money will continue to pass through as the algorithm has already registered it as a pass, (unless as stated they do it as a one-off payment and then try re-submit) until human eyes actually look at it and go 'Huh...Jimmy 69 has donated a thousand dollars every month to the same dev for the last eight months now...'
Do I think Gumdrops is laundering Money?
If he is, I imagine he'd be far more likely to do it through his site than through Patreon where he'd have more control to balance the books etc and not have the Patron censor leaning in so much, on his site, he'd only have to balance the books for Paypal.
Neither of the methods I've mentioned is particularly practical given the number of Patrons he has. If he IS laundering money through the Patreon, it's probably small scale and mixed in with actual donations.
Conspiracy theories aside though,
It's more than likely he's just a Dev who clearly understands how to exploit the hell of sunk fallacy cost and how to exploit marketing in an industry that heavily relies on self-regulation when it comes to actual 'quality' through sites like F95 that *Ahem* don't have a lot of legal power when it comes to actually stopping these devs.
Is Gumdrops a liar? Yes
Is he incompetent? Yes
Is he a con artist? Most likely
Is he a money launder? ...Meh.
It wouldn't be the first time I've seen Devs be wildly supporting by fanatical fans too deep into something to back out, plenty of devs have come and gone before *cough* Team Nimbus *Cough* Wootch *Cough* Aorrta with similar strategies. You keep the front of house clean, make it look presentable, release enough of a 'good' product to keep people hooked and then just release constant teasers with ready-made excuses why you couldn't make the deadline and folks will support you, either blindly following, or stumbling onto it unaware of the bullshit going on back of shop.
Now if you want to talk about something far more credible legally in a case against gumdrops,
I think you could definitely make one for False Advertising. 
