The article is evidence there is confusion in the marketplace - people are contacting the cartoonists about the fraudulent works.
Now the argument can be where does the infringement land - does it land with the person who generates the cartoon, fails to remove the signature and uploads it to instagram? Maybe. But I don't think we should be giving these AI companies yet another get out of jail "oops you made a machine that does a bad thing" card.
I also firmly believe there are contexts in which merely producing the trademark and attaching it to something is enough to be infringement but I'm not going to do the legal legwork to get there to your satisfaction, sorry.