To be fair they do this with everything; they scour twitter and sweep search back a decade trying to find traces of anything that isn't current year Le Based and Le Approved. They are fun ruining faggots, just from the other side of the spectrum.
And you've just put your finger on why there aren't many vtubers who proactively cultivate a right wing audience even if they have very strong right wing views. Leftist outrage is intense but brief and remarkably forgetful. Right wingers are methodical and encyclopedic, and love to purity spiral at the slightest hint of dissent. I hate how much prognonsense there is in vtubing, but I completely understand why there is so little pushback too, even from people who'd like to.