In this video I fell through the floor. could this be used in attempts?

Video is here:

Very good find. Yes this could definitely be used in Speedruns, I have figured out the way to beat the level using a variation of this technique.

Interesting, I'll look through some levels and see whether there's a use for it

I think if you could create a wall using your sonic screwdriver fuel and then clip through the floor that would be very big