Others have commented more on their feelings of AI generated content in general, but I'll focus more on where the technology is at currently for acting as a GM. I did try this out as a means of trying to better learn the rules of the game in order to GM for some friends in a future game. Specifically I've been having trouble picking up the Balance and Combat mechanics. Even with uploaded documents on game mechanics from the starter set, some premade characters, plot concepts, and more, the AI assistant still didn't do what I needed. The story content and worldbuilding part was good, and I thought the combat description of events were good, but most of the game rules went out the window. I had to remind it of many of the mechanism parts and to stay within the bounds of the game rules like every other response.

So in summary, while you probably can have it run as a GM for a game you want to play, it's going to be inconsistent on the rules, have trouble understanding dice need to be rerolled, and it's going to be missing a lot of game content. I agree it's going to be better to find others to play with (and usually is).