Saves a tenth of a second. You clip into the side of the second spring in spring city and it makes you jump and you maintain speed. The normal strat loses speed to the angled ceiling so it saves time. Video shows it better:

This strat has been known for a while, you just don’t see it in many top runs because it is difficult to pull off and isn’t such a large timesave to classify as “reset-worthy” if you miss it trying to go for WR. Hope this helps.