My thought as well. Maybe sync was in default configuration or I just copy pasted it without reading.

Long story short, I have no idea if system user passwords and sama user passwords are the same thing, how to set them up (if they are not the same), or how to make samba use same user accounts and passwords (so that I don’t have to remember one more password). So I just gave up.

I was trying to do everything according to arch wiki, but either samba is overcomplicated for no reason, or the article is just not written well.