(I'm the author of the post)

Just as with "you're absolutely right" and the em-dash thing, the image models have a load of habits they fall back on. Some of them are easy to spot - the yellow filter, making grids of icons, ...

Others are things you recognise subconsciously without being able to describe consciously. I've been experimenting a lot, and I can probably see more tells than most people. But sometimes it's just a sixth sense.

And some of those tells do now give me the ick. And some of those tells are in the "better" posters on that page. Today I would clean them off.

But I still think it's unnecessary and dishonest to try and hide that it's made by AI - just tidy up the bits that give people ick. Same goes for text, btw.