I definitely am aware of their tendencies this way. I'm not saying I buy it as gospel. It's relevant so I mentioned it. A couple of things I would say though:
1. January 13th is really, really, really early to be engaging in this sort of disinformation campaign. Ideally you either want to throw something out there that CAN'T be vetted (e.g. this guy was a real ass during interviews and threw his teammates under the bus), or you want to throw something out there to where it's too late to verify (i.e. something your doctors found). The sort of information Campbell dropped is actually pretty easy for a team to verify or debunk, especially with enough time, of which there is plenty.
2. Most scouts & coaches do not really operate with this Machiavellian M.O. that the only reason to speak to a member of the press is to give them something that benefits you or your team. I know this firsthand. These are people that work in proximity with one another. They share interests. They develop relationships. They develop friendships. They often love the same things, and therefore love to talk about the same things. Again, I know this literally as well as is possible to know this, because I have upwards of a dozen people that I have relationships and/or friendships with that give me true and verifiable non-public information (about sports). Sometimes they give me information to be nice because we're friends. Sometimes it's just because these people are tired of being stuck in their silos and have a desire to gossip about what they know. It's human nature. NFL people as a rule LOVE to gossip. They need to be actively scared out of it in order to not do it.
As for Tim Williams, it would make a little sense to me. When I've watched him, I've gotten the feeling that Nick Saban plays him like a talent that he respects, but a player he doesn't trust. This would make sense as context for that.