Yeah, I know, late to the party – but since I'm here anyway...........
According to what I've been able to gather from the latest on the gray color mutations, the red feathers are due to follicle damage; which explains why older birds sometimes grow more of them.
So basically those all red African grays are just birds with really bad skin, which isn't necessarily a bad thing if it's not bothering the bird.
Strangely enough, I was actually looking for information on the lutino Congo African grays when I found this topic via search. As far as I can tell, there's a couple of pictures, and a couple of mentions, and no one actually selling these birds. If it's like the lutino mutation in cockatiels, it would be a great improvement for people with allergies, as in my personal experience a lutino cockatiels shed much less feather dust then their wild colored relatives.
Unfortunately, I suspect it's probably like the mice with the yellow fur that are descended from regular brown mice that were overfed – it takes about three generations to undo the epigenetic damage. The fourth generation is brown again provided the last three lived normally as far as a mouse diet is concerned.
There seems to be a lot of prejudice against certain mutations, but there might actually be a scientific basis for those two particular ones. I just don't have enough information.
Were it not for cost constraints, the mutations could probably save me a lot of emotional turmoil when I finally find a way to replace my CAG that was murdered. To be fair to the bird though, I still feel strongly to know why. It's not a aesthetic debate, but rather an ethical one concerning the health of bird.