This doesn't read like LLM spam to me. Punchy 2- and 3-word sentences are a rhetorical device that I haven't seen ChatGPT (at least; I haven't really used the others) use at all.
But it's more the "It's not x; it's y" and "that thing saying z? doesn't mean much" format.
That said, I just double checked with some of the online LLM checkers and none agreed with me. Maybe I had a false positive.