So I was playing the game until I was messing around with the respawns, After Dance Recital Dash... If you respawn in the middle of the load screen, you can skip mostly half of the Cutscene. I don't know if this works with any other cutscene, somebody will have to mess around with it but it's a bit of a time save

that's a cutscene skip and no one does it because it's an actual sleeper category

run the game

If "cutscene skip" refers to a category within speedrunning that involves skipping cutscenes but is considered less popular or engaging, then it might indeed be referred to as a "sleeper category" - meaning it doesn't attract as much attention or participation from speedrunners and viewers compared to more popular categories.