Let's have a look at the snippet from the last page.
And it wasn't simply an ordinary enormous chocolate factory, either.
Could we add some commas here? Let's see.
And it wasn't simply an ordinary, enormous, chocolate factory, either.
Read that out loud. Do you notice anything weird?
It now sounds like the factory is made out of chocolate, not that it makes chocolate. That's very strange. The second comma is making that effect, so let's remove it.
And it wasn't simply an ordinary, enormous chocolate factory, either.
Read that aloud again. Do you hear the difference?
Now it works fine.
So the answer is no: you can't put commas after any old adjective. You have to read them aloud in your head to check that they aren't changing the meaning of what you are saying.
Another way to test whether you can put a comma between two adjectives is to try putting the word 'and' where you want to have a comma.
And it wasn't simply an ordinary and enormous chocolate factory, either.
And it wasn't simply an ordinary and enormous and chocolate factory, either.
Now it's even clearer that that the comma between enormous and chocolate doesn't work!
