I have a teory for that combo... it looks to me a simple programabble combo unfortunely impossible for human Hands.... I say teory cause I can't prove without an High quality video. anyway... here is the deal.
First, if any of u tryed to do it, figured out that the first j.B dont hit in Aoko like in the video(Nero and Warakia can Hit), why is that? THe Jump have a limiter or something like that to prevent instand air normal moves (don't know why exatly) but I think it works only for a few normals. a simple test to see that is just press up+B, the B simply will not come out in the jump. Knowing that u will see that the first move of the infinite's repetition would be impossible, however... there is a catch.
U can't do an instant j.B, but if u try with a double jump u will get it. I mean, j, up+B willl get a B.... but so what, the double jump will be too high....
I made some combos and studied some too in marvel vs capcom 2, and there was a term used a lot in combovideos and not much in matches, Instant Double Jump. Just as the name says just press jump twice the fastest way possible u can.
Still u will be too high, u can try as fast as possible to u.... it will be to high.... so... that where the programable pad enters. I don't know the cap, but if u supose u do a double jump in an a space of time of 4 frames (jump, 4 frames, jump) then u can program to do in 1 (jump, 1 frame, jump) Of course it's humanly impossible it (who know what a frame is, will understand) then u maybe can get the right heigh.
EDIT: 60 frames = 1 second
As u can see in the video, u don't get a "humanly" double jump but is pretty possible that this is a double Jump, just can't prove cause the video in youtube is in bad quality so can't see for sure... hope it all isn't that anoying =p...