The claim these companies make goes much, much further than that.

They claim LLMs "uncopyright" their inputs. So if I take, say, 50 Mickey Mouse comic books, tell ChatGPT to read them and produce 50 "Buster Beagle" comic books that there is ZERO "copyright contamination" and I own those 50 output comics without Disney having any claims on them whatsoever.

Or if I ask ChatGPT to "make a spreadsheet software like Excel, Sheets, Calc, ..." that, again, there is zero copyright claim possible from these people.

It has not been tested, of course.