What is weird though that this guy would just enter his name + birthday on that gematria site without thinking.
There is this other calculator which doesn't send any data over, but he's using the one that does.
Would be a way to figure out the people involved in this. That YT channel could be used for the same job (in case you are logged in) and at least for now I haven't seen anything like that Sebastian R L C channel on this other channel.