First of all I don't know why you blocked out the poster of the reply cause it makes you look unhinged. Second of all, there is quite a lot of proof that shows that it's not real. Here's a whole list of info about it
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Second of all this has happened to websites before. A doujin website named Sanaku had the same issues back in 2019 because the same troll tried to do the same thing with Splatoon porn there, they realized that the website was not Nintendo, did nothing, and are still up today with no issues.
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All this really points to is that Garry is a retard who doesn't know how to identify what an actual DMCA is and what is a phishing scam and is doing all of this because he doesn't want to look like an asshole who removed a bunch of mods for no reason. Probably finds it easier to remove the Nintendo mods anyways, but remember this is the same guy who doesn't even know what file format his game's files are.
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