I wouldn't go there yet, but if he truly meant it as it sounds, then it's a good sign.
We need him to go apeshit like he did when Campo and his staff lost the 49ers game towards the end of 2002.
When we didn't go for it on 4th and 1 to try and seal it and subsequently allowed the 49ers to score a TD and win with only 12 seconds to play, Jerry Jones lost it. I still remember being furious over the coaching staff not going for it that day, but even worse was the explanation why -- "We didn't have a play for a 4th and 1 there".
After the game, I remember reading about how Jerry was furious going down the elevator to head towards the locker room and was overheard by DMN reporters saying "They F'd it up! The players deserved to win that game and the coaches F'd it up!".
That led to him reaching out to Parcells that very same night because Jerry had finally reached his limit.
Even Jerry could see what a terrible blunder that was. So I'm hoping he felt the same way after Garrett tried to defend their failure to help the LT spot because "When you have Tyron, you're not used to having to help that spot often".
So while it is refreshing to see him call out Garrett for once for his poor coaching, I wouldn't get too excited until a report comes out of him having another outburst like the one I described above.
But if there were ever a chance that could happen, maybe it could be now? He's pissed about Zeke, pissed with other owners, and he's in the middle of an ugly dispute with the league. Maybe another last minute loss due to a huge coaching blunder is all he would need to throw him over the edge?
One can only hope.