I mean, from a quick test of Perspective using their web page, it is not flagging some pretty strong political statements (mentions of late stage capitalism, calling republicans fascists, accusing Democrats of turning the country into a communist nanny state, etc) and none of them are getting flagged. Whereas, if I tell that text prompt to "go fuck your mother", it understands that is toxic.
Because... this is kind of a solved problem. There are inherent biases but the goal of this is not to figure out which black man we can frame for a crime. It is to handle moderation. And overly strict moderation means less money. So while there likely is a bias, it does not seem to be an overly strong one and probably actually reflects the perceived reality.
Honestly? It sounds like you don't like the outcome so you are effectively saying "fake news".