It's a fair enough assessment from Lazar. I don't think even those with the most strong feelings against Mac would say he is solely to blame. It's very possible that Mac is both a poor NFL caliber QB AND that the team, Offensive coaching and players failed him. They are not mutually exclusive positions.
To me, Mac is a 'Goldlocks' QB. that is, he will require everything to be just right in order for him to succeed. he will need a stellar O Line, great RBs, great receivers and TEs and great offensive coaching and playcalling. He doesn't have the talent to work around those things.
And I don't think the Patriots under Bill will ever give that to him, Bill will just not focus on getting an all star offense around the QB, it's not how he builds his teams. So Mac is probably better off somewhere else. Like under a McVay or a Shanahan. It's possible he could get some success in teams like that. But everything would have to be just right.
Bill got away with a lot with Brady, no question. I think a running QB, a guy like a Hurts or a Jackson is the kind of QB he would prefer to help make up shortcomings in the offensive weapons in his teams.