Lipstor, since this game doesn't currently require payment to download it, you can actually just download it from the official game page here on Itch.io without having an account. I just did that myself, and I reccommend you should try so as well to confirm.
I have no way of knowing for sure where Yamaho has been on the internet before browsing this forum. This forum is public and requires no actual Itch.io account to be able to read every thread in this forum. You only need an Itch.io account to be able to post messages yourself. It's likely that Yamaho just found this game while browsing Itch.io, that's how I found this game. While it's true that Yamaho has only just started actually posting in this forum, you can read the forum without commenting or even having an account. Yamaho themself has admitted to having been " . . . following this forum for several months . . ." and that they ". . . applied for account recently. . ." They even explain that they " . . . will often read the comments for knowing the possible content of game . . ." Which they said they did before they applied for an Itch.io account. I have yet to see any lead that indicates that they're connected to the piracy forum you've mentioned. I doesn't mean that there isn't one, it just means I haven't found it yet if it does exist. It's not easy parsing all this info and providing quotes, so it's possible I have failed to notice some information. Sorry if I've misinterpreted what you meant.