Personally? Vibes. Specifically, it feels very... uniform. Like, a human artist good enough to draw like that would be better at composition, I think?
More practically, even the newer ones struggle with specific shapes; look at the arch, no human would draw that weird hybrid of an arch and a... semi-donut?
Older models struggle with lining stuff up and keeping things straight over long distances. The latest ones struggle with constant curvatures.
Every time I read it I think "well, I remember it, it's not going to be as funny"
And every time the steady rising tempo with no breaks just. Completely kills me halfway through