Yeah the "more than a paragraph or two" is key here. Indicators of AI writing work both ways; the more text you write, the more likely you are to "slip" and use some phrasing or syntactical constructions uncommon in LLM output. (This is why AI detectors perform worse on shorter excerpts.)
I posted this elsewhere, but convincingly, consistently "writing like AI" and never slipping once takes an amount of knowledge and skill analogous to art forgery. Except that with art forgery you can at least make millions of dollars off it.
That HN was a neat community fifteen years ago, but like all things cool made by early adopters, it will eventually attract a following hoping to be somewhere, to exist among people doing things, but the tragedy of such followings is that they bring with them their toxicity, their immunity to their own poison, and drown out what they depend on until the early adopters early adopt away.
The real slop is all this lazy concern farming from an ant mill that is powerless to do anything except validate its own hand wringing.