you really just have to practice to get it, it’s a really hard link so it’s easily the biggest barrier to entry for most people wanting to play her. Envision the rythym in your head and you’ll get it eventually
This is just something I follow myself, not sure if this works for others just to lyk: When Satsuki's hand flashes after 623[A], press 8 or 9 and do j.[c]. I'm not sure about the timing about j.[c], it ain't at the apex of her jump otherwise the opponents techs. so try and do it as soon as you can without rushing it. also just practise simply put.