This seems like it could very easily be hyperbolic statements here, given how Cell himself still makes the same "
I've already stored up enough enegy to blow away the entire solar system" statement as he does in the manga. Blowing up the Universe is so many orders of magnitude larger than this that this would make no sense to even bring up.
"Everything" in this case doesn't necessarily mean every single thing in the Universe; the context is the first part of his statement where he says the Earth will be blown away. Everything that makes up the Earth will be gone with no traces remaining.
Neither of these statements imply it being done in a single attack.
This is just a similie. It is "
like" the whole Universe is shaking does not mean the same as the Universe is literally shaking.
We know what is meant by this.
Cell states he can blow up the Earth then use Instant Transmission to go to another planet. His plan is to destroy the Universe bit by bit, not all in one go.
If Cell was going to destroy the entire Universe at once, why would he mention teleporting to another planet? There'd be no planets to go to.
I just want to note that I think is is particularly funny after many people have complained about my earlier thread on Cell's Solar Kamehameha, people argued that Cell's Kamehameha couldn't possibly be thousands of times above his ordinary rating... but now people have no problem with charged attacks being 3-A for Toei.