Weird that I couldn't find the paper on arXiv: in my field I just google the title prefixed with "arXiv" and it pops up. Some earlier articles by the same auth

Weird that I couldn't find the paper on arXiv: in my field I just google the title prefixed with "arXiv" and it pops up. Some earlier articles by the same authors are there though (e.g. https://arxiv.org/abs/2310.06106 https://arxiv.org/abs/2310.06106), does the journal of chemical physics prohibit arXiv posting or is the norm just different in that field?