The most interesting (to me) aspect of Alexander's post is that 5/11,000 people scored 49/50 (98%).

That could happen randomly if all people had 82% skill, which was clearly not the case.

It could also happen if a dozen people had 98% skill, except then someone would almost certainly would have gotten a perfect score by chance.

The most likely answer is that 100-200 people had >90% skill, and everyone else had lesser skill, or simply rushed so they could see the answers

I suspect the challenge would have been easier without human-operated computer-generated graphic art mixed in; most of the pictures had tells, but you had to be familiar with the genre.

The Riverside Cafe (extra chair legs) and Anime Girl in Black (excessively detailed armpits) were two of the most obvious AI examples. In the case of the Gauguin, the road leads to the village. In the AI version, there is a narrow footpath to nowhere and a random smattering of isolated houses.

Art isn't just about rendering something, it is about leading the eye on an emotional journey by drawing the eye toward significant details or symbols, however abstract.