Knew the NFL was full of it when Suzy Kolber reported Stefan Diggs was in a towel. At that time the game had not been called.
Moments later ESPN talking heads were like, well, if Stef is in a towel the game is probably over...
A few moments later the NFL officially postponed it per ESPN.
At the stadium, though, fans were still in the dark on whether or not the game was moving forward. There was no announcement at the stadium until a bit of time after the postponement was reported on ESPN.
If the NFL had actually postponed the game in the interim 40 minutes between the players leaving the field and Stef being reported in a towel, logic says the NFL would have let the 50,000+ fans in the stadium know the game was postponed before it was reported on ESPN or at the latest moments afterward.