Why do we call french fries French and not American? Point Approved.
Don't mean to burst your bubble but "fries" comes from the word "frites". And they aren't american either.
Does it matter? Probably not to most people. What the moves are called doesn't change what they do, but thier name is an interesting thing to think about. After all, when creating a game from scratch, nothing is a given. Everything has to be made up, thought up, built up by someone. It can be interesting to consider why things are the way they are, and how things would be different if things were not the way they are.
Hmm... what would I call them? I suppose for me, it would be important to set them apart from other games with supers since supers in this game have an addition level of importance, being the only way to score. A unique name would also have the added benefit of setting PS All-Stars a bit more apart from the obvious comparisons and give the game even more of its own identity. Of course, the gameplay will be the true differentiator, but if we're confident in the gameplays ability to do that, why not customize all of the other parts of the game as well?
It's like the shield item; they could have gone with any old shield icon or whatever, but they went for the shield in WipEout. That's a neat little touch that is, for some people, ultimately meaningless in terms of functionality. For the rest of us, it's neat and it gives the shield a touch of personality.
If supers are so integral to the game mechanics, shouldn't the name have some personality too?
How about "Dual shocks?" They give you points and knock out your opponents. Hey, there are even three DualShocks the level could be named after.
Or... "Circle Moves" Assuming their peformed on the circle button, this would also be a name suggestive of the game's "celebrate PlayStation" theme.