It's literally the move 3,4 (basically the same move that string from b+1,4 into 3,4). The individual move is named Gancho Chibata. It's an instant sweep from standing into a juggle. In TTT it was worse because juggles got extended with B!
Fuck that shit.
Edit: See your own twitter link! God that infuriates me!
Oh so you meant 3~4? The slow low that is seeable and -100 on block?
Yeah, that's not bad at all. The problem with the move in my twitter link is that the whole string is a counter hit combo off of a very fast mid. b+1 is only 14 frames, which is pretty much general mid poke territory.
In low to even general mid levels of play, people don't know how to punish the string properly. Stuff like b+1, 4 by itself being launch punishable on block, or the fact that you can sidestep right after the initial back 1 to avoid all of the follow ups, or even the fact that if you just stand still and they complete the string into the low, the end low doesn't trip you, so you can punish them with a float for free.
This all changes at higher levels of play where the good players know how to confirm that string, so you can't even punish them properly unless you fully commit and put yourself in harms way.
Top all of this off with the garbage tag system in Tekken Tag 2 allowing for absurdly damaging combos like the ones that I linked earlier, and you have a recipe for disaster.
The other general annoying Capo stuff is the relaxed stance stuff. Specifically the low hitting slip kicks out of that stance. Low combo starter where it has to be low parried to be punished at all.
Or something like b+2 (or is it b+1?) the auto sidestepping mid that almost works better than a regular sidestep. A major weakness for Capos was supposed to be their lack of sidestep, but this move damn near completely negates that.