The BTT run is made using clips spliced together, it isn't an RTA run in any form, it is simply used to show the limits we can push the game to. Also there is nothing stopping BTT strats being used in runs, like CBert said, it's mainly down to difficulty. Double DSTA is the single example of a strat not allowed in RTA runs that is used in the BTT, dude to having to drain the battery of the switch, but since the BTT is a concept and no battery drainage is required it isn't a pain to use it for that specific purpose. Also we don't have savestates at the moment.
There is a leaderboard on a Google Sheet pinned in #minigames in the SMO Discord, here is the link for it: https://docs.google.com/spreadsheets/d/1SRZbWF2k0F1CzZFXu0s09nqdCfaHMUYBXUE5_PcIga4/edit?usp=sharing
You should probably just message the mods about this instead of making a forum post about it tbh. And if you have messaged them already and they said no, making a forum post wont change anything imo.
use livesplit for the time and use obs (open broadcaster software) to put it with the gameplay
I think a TAS could get sub hour bc that shit would be so insane imo
I have a delay aswell, i just split dependant on what is shown on my obs so it looks normal on video.