[D] ICML paper to review is fully AI generated

I got a paper to review at ICML, this is in the category of no LLM assistant allowed for writing or reviewing it, yet the paper is fully AI written. It reads like a twitter hype-train type of thread, really annoying. I wonder whether I can somehow flag this to the AC? Is that reason alone for rejection? Or should I assume that a human did the research, and then had LLMs write 100% of the paper?