I have done semi complex move combos with Cappy in SMO, not sure what you consider "the" tech though.

Doesn't matter. It's cool to pull off, but it's not required in any way. And most importantly in the end those combos are not programmed that way, they're a string of independent moves that are directly associated to their button.

I have no idea what is supposed to connect "get a boost" to "rapidly alternate left and right direction buttons while you drift".