It's the amount of little icons and bold text. And then phrases like "No NAT, No Port-forwards"

Also details like the light blue boxes being swapped.

To me there's something about the "AI Slop Font" where it instantly triggers that uncanny valley. I guess since it's kind of an average of a bunch of fonts so it's somehow familiar but also unfamiliar at the same time.

Absolutely can relate. Thats why I would say: Do your own diagrams! At least the text and formatting.

Where I do think it ads value is "AI slop 2". This is somehow even better comprehensible than an average photo.