Because (a) that vision of utopia is not party of any "self-proclaimed communist" philosophy that I've ever heard of, and (b) no one believes that's what's going to happen.

Instead the evidence of our own eyes tells us that AI seems to be worsening the K-shaped economy: a handful of Elon Musks will become trillionaires, a slightly larger number of engineers will become billionaires, and the rest of us will have fewer jobs and fewer prospects of upward mobility in a world where AI can do most entry-level work.