That isn't quite right.
They make 2.4K a month from Patreon, which is the non-ABDL version of the game. The full version with controversial content is hosted over on SubscribeStar and that's an additional 2k a month, so it's much closer to $52,000 a year. That's also just the people who stick around to contribute to the totals listed on both websites. In my experience, somewhere around 30% of income is people who pledge, grab stuff, and leave immediately, so it's probably a decent bit more than it appears.
And that's without updating their game or communicating any new content for almost a year.
I can totally empathise that game dev is hard, and that sometimes maintaining communication with your audience is difficult... but like, damn.