That's because jj is relatively new, and constantly changing. The official tutorial is (by their own admission), out of date. People's blog posts are fairly different in what commands/usage they recommend, as well.

I know it, because I recently learned jj, with a lot of struggling.

If a human struggles learning it, I wouldn't expect LLMs to be much better.

That's ironic considering jj is supposed to make version control easier.

It does make it easier. Don't conflate documentation with the tool itself.