Nice, I had to watch a bit more of the full vod since the clip doesn't seem to capture his best attempts at this, but given sparky position it looks like this can save as much as a third of a second compared to the usual strat done by top runners.

Speaking of 7-1, and excuse me for hijacking the thread, there's another time saver here that currently doesn't exist in any runs on the leaderboard. Rockets blast off every 64 frames (so they're also on a frame rule), and a while back RetroBob figured out a way to reach a faster 7-1 rocket cycle in real time:

I believe this faster rocket hasn't been documented anywhere outside of Discord so I felt the need to include it here.