Doesnt this prove creationism wrong?

Well, I'm not at all a creationist, but THAT doesn't necessarily prove creationism wrong; you are uming that new matter is being put into the universe, but matter can neither be created or destroyed. The m of universe is expanding, yes, but the density is decreasing at a proportional rate. Things are getting farther apart. The universe is infinite and probably cyclical, so you're right, there is no "creation" per say, but this particular argument does not disprove creationism, as ridiculous a notion as creationism is.