The 'expert' in question being yourself I take it? Just what we need, another ferret rescue messiah here to preach to the masses....
There's people on here who have kept long lived ferrets all their lives, 20, 30, 40 & even 50 years in a few cases... If you want to correct people and try to educate, try to do it without coming across as if you know better than everybody...
I've had ferrets a mighty long time and they are fed on the best and thats FLESH not stingy by any means I feed them as any carnivore would eat in the wild naturally
I've said it before and probably will