Hello,
Currently, as far as I know, the sync works in one direction Kitsu -> AYON
You can sync/bring users, projects, tasks and etc from Kitsu to AYON but not the opposite.
The docs you mentioned is deprecated from OpenPype days.
There’s a PR for updating kitsu addon docs.
Also, for reference, here’s a the community post where kitsu sync was discussed
I think @Danell can provide further insights.