Chateau, Domaine, Rayas, des Tours, Fonsalette, Vaucluse, Pignan, CdR, Reserves, Grand Reserves rouge et blanc

I’ve heard recently that single variety Cotes-du-Rhone is not allowed (anymore … or ever?)
A 100% Grenache C.d.Rhone had to be declassified.
Could that be the reason?

I thought this rule applies to the Reds only?
But I am certainly not an expert here.

I’m scarred for life after the Des Tours fiasco Robert and I went thru and also my last 2008 Fonsallete🤢

1997 Pignan was pretty good though