People from that site contacted me and said, in part:

By no means are we leading anyone to believe these kittens are available for adoption or that they were kittens previously adopted through or organization. NEVER before, prior to you has anyone ever thought the pictures were anything more than decoration.
Without mentioning Peanut by name, she said she had been contacted by one cat's owner annd that that image would be taken down.

I am hoping, after I forwarded her the proof - the links - that she will remove our other images as well.

I know they are a shelter, and are doing important work, but surely they have plenty of adorable kitties whose photos they could use.