There is no quote from Cameron that they regrained it, so you'll never accept any deduction based on what he did say.
I edited my post with the direct link grabbed from the source. Skip to 5:43. Quite apart from "minimizing", he literally says that they fully removed the grain, twice:
"completely denoised and degrained it"... "we got rid of all the grain"
There is also his insane "uprezzed" word choice that helps nothing.