It violates the Collective Bargaining Agreement. Which doesn't allow teams to confer on free agents.
So, yes, it would be a form of collusion.
Right. Basically, Anthopoulos--who is generally better with the media than this, so this surprises me--admitted to checking the temperature of players and what other teams were expecting to offer them. That's collusion, and MLB got hammered for it on three separate occasions in the '80s.