It's not ridiculous at all. Players stage for 'Dangerous Tackles' several times every game.I guess the MRO decided Walsh didn't do it himself. I don't care whether it was a week or not. Blaming Walsh for staging is ridiculous and none of you would have said it about your own players.
It's unfortunately become a very common practice.
FWIW, I still can't work out how he face planted from that action by Dangerfield. Weird. It kind of defies the laws of physics.