100% Whey Protein

Is Unflavored Whey Protein Considered Dairy where i would have to wait 6 hours in between eating milk and meat?

Nope. You don’t have to wait.

Thank you. Where Do we learn this from ?

We did extensive tests on samples many years ago. This is not edible on its own. You can’t eat it by itself. It only can be eaten as a component of a product. This makes it not meat nor dairy. It’s like cardboard.
ראוי לאכילה is a key requirement here.

If there were flavors in it also would that change anything

No difference. We would just need to know that the added flavor is kosher, but it wouldn’t make the whey dairy