> a painting signed with a [facsimile] signature of Dali

That's not what's happening here though.

If you look at the original tweet (https://twitter.com/LaurynIpsum/status/1599953586699767808) it seems that the complaint is about the "mangled remains of an artist’s signature". I don't see any examples where it's actually copying the signature of a specific artist.

(Please do share an example of that if there is one.)