Anyone who arrived here before the online reporting system began will not show up in that system, the only way to join it would be to leave the country and return.
It is not a proof of ownership of home or condo. Tabien baan is literally house registration which lists all foreign individuals holding a ‘Temporary Stay’ or a ‘Long Stay’ visa/visa exemption who live at the condo or house address specified in the house registration book
If you join the Thaivisa.com forum there are some pinned posts that detail exactly how people got Permanent residency, and Thai Citizenship, Not an easy thing, unless you are rich or Chinese......