Of course you get more than 5 stops! You can get 5 stops above mid grey and still have 5 or more to play with below mid grey. Anyone with access to a camera and an understanding of exposure can do that for themselves and see - it's not hard. You've got to have a light meter though... And know how to use it. And a Stouffer will show you all too.
RED does not clip like consumer video. Absolutely not. It does not crush blacks - absolutely not.
Perhaps it's time to stop feeding the trolls....