OF COURSE THEY ARE!
AI is a reflection of its training/input. The media, all media, when taken as a whole is left leaning... Yes there are right leaning outlets, but they are far fewer in number, so when you take the general output of the media, all media, feed it into an AI, and then tell it “learn” from it, of course its going to product output with a left wing bias.
Yep. As the old saying goes…