When you apply for a game registration on the Speedrun site, I know that there should be a game play video, but how are the games before the launch registered? Personally, I was curious. Is there anything related? (linked)

Most times games added before release come from series moderators who add them ahead of time. Other times, site staff make exceptions to the rule of needing a run for well known games and users. It’s nothing more than site staff discretion of allowing a game prior to release to be added.