This is an Pentominous with the variant that each given is off by one in one direction or the other.
NOTE This is fairly bashy and was mostly made as a meme in response to someone saying “The worst pentomino is either I or X because I haven’t been able to find a 10x10 Pentominous which has only Is as clues but a solution grid different from the one on GMP several years ago; and I haven’t been able to find a 10x10 Pentominous which has only Xs as clues”.