Firstly, theymos clearly does not state that he will disable all animated avatars, especially avatars worn before the change. It means users who worn animated avatars before the change will be able to wear them as kind of glitch.
He did clearly state it and thanks to @nc50lc, he quoted the what he said. It's more like a grace period for those still wearing animated avatars they uploaded before the new implementation came into place.
Stake signature campaign don't have a public spreadsheet which is kind of weird but already accepted by many members that it is okay to maintain privately.
It's easy, just check out the signature campaign thread where members applied from. You will get everyone there.