You have to look at the video though.
That was NOT the "regular" part of the sign, it was the BACK of the stadium signs. That message was PROJECTED onto the outside of the stadium, it did not run on the inside message screens. Given that there was a SEPARATE projection done on the side of a building in Jax (plus the stuff on the various expressway overpasses), I would hazard a guess that this was a coordinated effort that did not involve actual stadium personnel.
Imagine if someone was in the Hard Rock parking lot and projected something onto the outside of the stadium, and that's what this was.