Exactly, this story is planted by animal rights groups to try to win support for their cause.
I see at least 14 separate pelts in the picture with identical color balance. Sorry, but this story is BS. If they're strays, they would have to go through an incredible amount of cats to achieve this. I'm tempted to crop them out and check the color curves of each one. There is no way this isn't manufactured, unless someone actually bleached the pelts to 100% white and then airbrushed them to make them look the same (yeah, right). Totally manufactured is right.