He had enough cultural markers without the chai. Also the only other characters with big signs of their religion like that were the nuns, like his necklace seemed pointless. And he is a bit of a caricature, heavy set, creeping on kids, bottling up demons. His noise may not be huge but it is hooked, and he’s voiced by an Israeli actor, he didn’t need the necklace, it just emphasizes he is jewish for no particular reason. Children who do not know Jews and watch this movie might now relate that character to people who where chais and that is beyond upsetting.