This falls into the timing, like anything else, where you place a bomb and lock them down, allowing them to move but not allowing them to create enough proximity so the bomb still gets them. I've used the air throw to reset the bomb counter before, but never as an infinite method. This is pretty useful I would say, if you time it right. Most people don't realize how far you bounce and for how long after the air throw. I love dropping a close bomb against a teleporter, baiting a TP, and then block and air throw on the bomb. I've been trying to teach it to Summoning. I'll give this a shot next time.
It's a cool reset method, but it's pretty similar to the bomb > aa hp > jk reset infinite method I already use. Unfortunately I don't see this affecting his game hardly at all, it's just too similar to what he already can do, though it could give him another option in certain specific situations.
Well they do help, of course, I'm just saying he's already got a large number of highly situational infinites and 100% combos, and I don't think this is going to be significantly better than what he's got in most situations. The bomb > hp > jk reset infinite in particular is extremely similar to this one, but I can see this one being easier in certain situations, which would make landing an infinite a little more viable. The other reason I don't see this making him significantly better is simply because it relies on the opponent making the mistake of jumping over you without being able to stuff your air throw.
I do want to experiment with the practicalities of this though, maybe there's an aspect to it I haven't thought of yet.