I thought I explained the situation with that already?
Basically, it's an alteration of a little trick Tenki found out MONTHS (maybe even a year) ago.
It's abusing the platform canceling tech on Smashville/Lylat Cruise by using cstick down (instead of down) to cancel out of SDJs and other various stunts. It opens up for nice follow ups.
It gives you zero lag upon landing, even after the SDJ, so ASCs can follow up very well if you do this kinda thing on Lylat/Smashville.
I got someone with an ASC > SDR > SDJ > grab using this little gimmick.