Note that the damning quote was from Vivek himself, in a puff media/marketing piece designed (as they all are) to make him look new and different/visionary while painting everyone before him as stuck/groundbound in thinking/vision.
I don't believe one word that comes out of his mouth.
I think he lies in his sleep.
I especially wouldn't believe anything he says that supports the narrative he wants to portray : that other people couldn't envision what he does, and his bold ideas are vital to the success of the team.
He's already been revealed as a laughingstock to the world (for right or wrong), so he has zero credibility in this regard.
On the other hand, Petrie ****ed up royally when he didn't publicly criticize Westphal after Westphal reneged on his "in-house" mandate and honesty claims of "player should come to me if they have disagreements and we can talk it out like professionals."
IIRC, Demarcus basically took him up on that and Westphal threw his public hissyfit, escalating and making public what he himself said should be kept in-house.
So Petrie may well have not supported Demarcus and doubted him too much. Of course, DMC was easy to doubt (and still is!), so Petrie's not alone in this regard.
I can't imagine Petrie being so monumentally stupid as to not recognize Boogie's abilities now, though.