I don't think they did that. I think they are "unfit for human consumption" whatever that means.
It was time for me to start the switch from puppy to all stage anyway so I am almost done switching Mia from Innova puppy to Fromms. If I were still feeding Innova, I would not be super worried about something harming her. It's more likely they think that they use sub ingredients that won't hurt you but are not something you or I would want to eat.
Hope we find out soon, I hate to see a good food get a bad reputation for no reason.