i don't know much about blanchard's theorizing and should probably read about it to understand if there is any nuance to it, but first thoughts about the anime actually makes people gay sentiment seems like a forced meme to troll and bait oversensitive weebs with and not much else.
i could see how some who dive head first down the moe rabbit hole might be closeted, even to themselves, and since there are a lot of teens into anime fandom… well, they probably don't all really know what they want at that point in their lives anyway. so, they would probably go queer or troon out with or without anime obsessions. it would just be some other catalyst that would lead them to know what they already knew, but didn't yet know that they knew. and also hikki neet types who are already damaged in terms of identity and then go trans as an attempt to cope simply because it is now an option popularized in the mainstream media.
again, just first thoughts, but i also imagine that publishing some pseudo-scientific theory about anime being a cause of gender bending and not just a medium with sub-genres that latent gender benders are attracted to would be published at this point in current year simply because it would garner attention and that attention would benefit the author, not because their was any substance to it. psychology and social sciences are full of that type of filler. any theory that can possibly be postulated will be postulated in the pursuit of publication, regardless of it's merits.
TLDR - just because more trannies played with dolls and girly toys as a kid does not mean that all childrens toys makes you gay, but you might be able to gain some notoriatty and cash in on publishing a paper that makes such a claim.
these places were pretty much human traffic slave rape dungeons, im not defending trannies but anybody who thinks psych wards were good should be shot.
The trends was already established prior to anime and manga with movies and porn.
The fact is that watching too much of cool women (with beauty) doing cool stuff (male stuff) makes appealing for a young male to indentify himself as a woman.
Maybe the antidote is just to make yourself (or your children) watch more macho protagonist.
There is also the fact that gay stuff ultimately attract people who are gay. It means that it is more a correlation than a consequence that people watching anime are in majority attracted by the same sexe.
You have picked my interest and I will do some research about Blanchard
Also the essay Ray Blanchard posted on twitter is not his own. He just reposted it because it had the same subject from his studies.
He latter responded he didn't knew it would attract so much attention on him from twitter mobs.