A&M's head of communication or whatever on twitter was trying to let everyone know A&M had nothing to do with it. it was quite hilarious.
I bet it was Muschamp. I bet he got his staff together and said "Do you guys want to create some bulleton board material while getting a good laugh at the dead dog cult? I've dealt with these assholes before. I'm going to put up a ridiculous billboard, but everyone knows the jizz-jars are so crazy they're just going to assume A&M did it." His OC probably came back with, "No one is going to believe A&M actually did that", to which Will responded with a half laughing "O yes they will."