You're an absolute idiot if you think that's how Japanese law works. You can still draw naked people, dipshit - you just can't distribute it. The more you try and make yourself seem like you know anything, the fucking dumber you look.
They are talking about the fact that a lot of the time what is distributed doesn't actually include the original uncensored art. Especially more recently, DLsite has been cracking down on games where you can dig into the files and find a simple switch and turn it off.
Some dev recently got caught with something like that because they told their followers how to do it, and so everyone is being scrutinized more closely right now, but even before that, lots of games didn't have any of the original uncensored art.
So any "decensoring" project, is less a remove the mosaic project, and more, someone has to go in and manually redraw all the parts project. Much more complicated.