[gold23]

Why don't you look at the actual article? There are several more egregious examples, e.g., the authors being cited as "John Smith and Jane Doe"

[ted_dunning]

I can see that either way. It could also be a placeholder until the actual author list is inserted. This could happen if you know the title, but not the authors and insert a temporary reference entry.

[gs17]

The first Doe and Smith example I could give that to (the title is real and the arxiv ID they give is "arXiv:2401.00001", which is definitely placeholder), but the second one doesn't match a title and has fake URL/DOI that don't actually go anywhere. There's a few that are unambiguously placeholders, but they really should have been caught in review for a conference this high up.