You'd think, but part of his tear down attempt is saying that Karen is appropriating Japanese culture and hypersexualizing it, which is personally the funniest part, because Calli's maybe the least sexy vtuber outside of lolibait avatars. The inclusion of that 'fact' makes it pretty clear he has at best a surface level glimpse at information and just draws conclusions, and has primed himself to be offended no matter what.
He also closes out the thread basically pulling a classic internet forum argument move of more or less saying "If you're a Mori stan or vtuber fan in general, don't even comment because you're already racist", which is something I'm very familiar with as I say variations of that myself when I'm intentionally baitposting.