This is patently absurd, as if keybinding was some arduous task that will involve the entire company. What's next, Kinect only? Sorry controller users, its all about motion now.
I hope he means something silly like not showing the PC prompts for QTE segments. Not allowing the use of KB/M is basically saying "we want free monies from you without doing any work", I can only assume he meant custom binds or whatever. The AC games have enough controls that custom keybinds are practically a necessity. Hell I find myself wanting to redo their input scheme even on the controllers.