Small, pithy quotes vs dozens of paragraphs are rather different things.

It does not surprise me in the least that a machine can produce excellent small quotes. Markov chains have been production some fantastic stuff for decades, for example, and they're about as complicated as an abacus. https://thedoomthatcametopuppet.tumblr.com/

Spoilers:

Question 1 had such different styles. I preferred the style the AI was using, but that was purely a stylistic preference.

Question 3 was a toss-up. They both felt fine, and funny enough they both had a "not just X, it's Y" pattern.

Those were the only two where I clicked the AI version - for the other three, it was obvious which was AI.

A few paragraphs isn't writing, it's a snippet. The shorter something is, the better AI will be at mimicking it, because underlying flaws are less likely to be made apparent.

Music is another great example of this. I enjoy techno/trance type stuff, but YouTube is becoming borderline unusable for this genre due to AI slop. You'd think AI would do a good job of producing tracks here since this genre is certainly somewhat formulaic. And about 2 minutes into a lengthy track I'd probably do relatively mediocrely at determining whether it was human or AI, but by about 10 minutes into a track it's often painfully obvious. I run this experiment regularly as I find myself having to skip the AI slop which YouTube seems obsessed with recommending anyhow.

Ironically AI is probably providing a boon to human DJs here, because actively seeking them out it is one of the only ways to escape YouTube's sloparithm.

I preferred the AI 4 out of 5 times. That's a little confronting. And judging by the amount of cope in the comments section, others found it the same. I guess it is a small test, but I think it successfully makes it's point.

I got 4/5 human. #3 - I chose AI, it was very close.

I noticed something-humans will use words precisely and loosely at the same time. AI will seem like it’s precise but a lot of the wording it uses can be cut or replaced by something else without losing much meaning.