@Figmo They have announced passwords don’t work with iPhone and all. The only sync options there at this time is for Bookmarks and History.
It will hopefully be figured out sometime in the near future, but there’s no promises. Unfortunately this has been in the works for a little over 3 years now, as can be seen by the comment at How to access iOS saved passwords? - #2 by Asad (which I guess you referenced in your Additional Information)
Just so you know, this part that you posted in is for support. What you’re doing is making a suggestion. So would best be over at Brave Feature Requests