Normally New Judge I find you very accurate, but on this I disagree.
Although I don't like or agree with the rule, I stand by what I first said.
If something belongs to James it can be described as James's or James'.
That is the very reason I pointed this out. The rules are far too complicated.
I looked into this because my son's name ends with an s (not James, but I use that as an example).
A teacher had put an apostrophe but no s after his name when describing him possessing something. I was sure, like you, that this was wrong.
I investigated but I found it can be done either way.