No he doesn’t?
Don’t get me wrong there are many places where the paper can be wrong (eg fig 1 or their magnetism exceptionally looking more similar to diamagnetism than superconductivity) but you are mixing him up with Ranga Dias who has had a history of data fabrication.
Dias has nothing to do with this paper though.

Got a source? When I first read about this people were cautiously optimistic partly because the head researcher was well-respected.

Btw. Schön Didn’t plagiarize in his PhD thesis, the title was removed because of his other shortcomings