so i've been looking into wanting to speedrun Until Then cus i loved it so much that i kind of want to speedrun it right now, and as of yesterday, a new update came out to Until Then fixing some bugs and improving some things, but also adding a new "Skip Text" Button which unlocks after fully finishing the Game and so i wanted to ask if using the button would be allowed for runs cus it is new and when i do decide to finally start running this game someday do i not want to get rejected for using a feature that's pretty new to the game XD

You can't because you need to beat the game first and because there isn't supposed to be any save file beforhand you can't.

The Skip Text button can not be used, but a wiped save file isn't needed if the Skip Text button is shown to be unbinded.