I think this is both true and untrue. Its true signing Zeke was a mistake, but that was because Zeke has always been grossly overrated. He peaked as a rookie, and has been downhill ever since. Their insistence on him ahead of Pollard probably cost them 1-2 games. Pollard is a far superior player, and has been for at least 2 seasons. Its always funny when they interview opposing HC's and the first guy they talk about being worried about is Pollard, and then he sees under 10 touches.
I think signing RBs to a 2nd contract can work, but it has to be an elite player, and/or one who is a mismatch in the passing game, Zeke is neither of those things.
I think Dak is taking too much blame. He's a top-10 QB, and while he didn't play well yesterday, its not like Garoppolo did either. The difference is Garoppolo got helped by his playcalling and his running game. I came out of that game thinking Dallas is a better team than SF. Dallas shot themselves in the chest in that game. Every possible thing pretty much went wrong, and it was still a 50-50 game. That to me means the difference was coaching.
I have to think that game hurts both Moore and Quinn's HC candidacy. Dallas seemed unprepared on both sides of the ball.