After listening to his interview yesterday, it's pretty clear that he does have good sources inside Dove Valley. The players are spouting the company line here.
It seems like the sources are not players anyway but some of Fangio's coaches. It's also possible that someone in the front office near Elway is leaking as well.
This does not mean that the problem is as dire as he indicates. But, it would be ridiculous to assume that a team can lose it's first 4 games and then go on to a 3-7 record and there's no conflicts and dispute either among the players or coaching staff and front office.
Such conflicts have abounded the last 3 years and resulted in 2 coaches leaving and Elway firing numerous assistant coaches as well.
There is just no doubt that there is serious dysfunction in Dove Valley, but that does not mean they can't get it together and adapt. But, they need significantly better players to accomplish this.
Unfortunately, the Broncos best players like Chris Harris Derek Wolfe, and Justin Simmons are not under contract for next year. IF they leave as expected, then the defense would be significantly weaker in 2020.