The issue here is that the Omnitrix is reacting to this explosion, a bigbang that created space-time. It doesn't matter how many time dimensions this explosion creates, because no matter how many time dimensions, it is a feat of creation and we cannot treat it as a standard immeasurable speed, there is no evidence that it happens faster than time. There is nothing extra about this explosion except that it creates a hyper timeline, which is not related to immeasurable speed because it shouldn't matter how many time dimensions there are. Apart from that, there are other things that don't make sense in this scene, so it doesn't seem coherent at all.
creating a high-dimensional universe = Immeasurable speed