It takes user input for the database to be updated, kind of like all of us collaborating on our local areas. For example someone like yourself monitors a system using ID Search On, and discovers new talkgroups by just listening. Once the scanner lands on a new talkgroup, the listener will monitor it for a while and intuit what it might be using "clues". (That might be something like on TGID 12345, you hear "Car A go to Service 1" and you hear Car A on TGID 56789, you can presume 56789 is Service 1.
After figuring these things out, users like yourself, or me for my local system, would submit the change for inclusion in the database.
Those numbers you refer to in the wiki are Radio ID numbers, sort of like radio serial numbers, that are programmed in the radios. That is so when someone pops up on the system they know which radio is talking. These are NOT talkgroup ID numbers you would program using your sentinel software. So that is why you are not hearing anything local.