He's basically just railed against cancel culture and what he sees as forced diversity in media. In the Chappelle vein, where they've convinced themselves they're not transphobic, just against "censorship".
Now, to be fair, Gilliam was always the most defiant, aggressively anti-establishment guy of a group who are all pretty anti-establishment. He's very much made a career off of being transgressive and pushing back on those that tell him no. So this isn't exactly unusual for him. "Cancel culture", to a 70 year old man who made a name for himself by being anti-censorship at a time when you could barely curse on television, would certainly feel like a familiar type of "authority" that they've spent their whole careers defying.
That's not an excuse, but it's also why I stopped expecting better from the legacy entertainers of that time who are all pushing 80. They've progressed about as much as they're going to in their lifetime. Just take away the microphone before they hurt themselves (or anyone else) because you're not going to change them.