Presumably this is why it says "substantially generated by generative AI", a diplomatic way of saying "GenAI slop". GenAI isn't necessarily completely off the table, but a very common usage scenario is. Admittedly seems subjective, but it provides a criteria to save maintainers from having to review unreasonable contributions without them having to identify some more concrete specific issue that is likely there, but it's going to be hard to find.

Also, unless it is very digestable, then I wouldn't even trust myself to be vigilant enough to catch the real issue even if I looked. It does a good job of looking credible like it should be right, even when it isn't.