Its usually common practice for mods to at least add world records like that if users themselves doesn't. Specifically through history, there's been alot of japanese runners for instance, without SRC presence. As such: Mods usually keeps tabs on a TRUE WR for said game and just adds it themselves so people have something to go on.

Exactly what @xenkaroshi said. A lot of Japanese runners used to stream or upload their runs on sites like NND, instead of YouTube or Twitch