Putting a signature on a work is forgery and in most jurisdictions charged as fraud.
If you produce an artwork in the style of someone and then clone the signature of someone who produces art in that style, there is a reasonable case for fraud.
https://commons.wikimedia.org/wiki/Commons:When_to_use_the_P...
> it may be reproduced, as long as the reproduction cannot be mistaken for an authentic signature.
Which seems applicable in this case, because the image is clearly generated by AI (at least to the guy who prompted it).
What does the case law say on what counts as "misattribution"? If a paste the "BLOPER" signature onto a jpeg, did I commit a crime right then and there? What if I put a notice next to it saying "btw it's not actually Brendan Loper"? What if I took that image (with the notice), uploaded it for the whole world to see, then some guy cropped out the "btw it's not actually Brendan Loper"?
[0]. https://www.newsweek.com/2016/09/16/digital-images-photos-gi...