Yes, there was an historic injury crisis - but those injuries didn’t happen in vacuum; they were the result of his training regimen, his coaching, and his in game tactics (mostly- some were contact injuries in games). With all the data science and medical metrics it was obvious when players were overtraining. The muscle injuries were to be expected.
I’m more concerned with Ten Hag’s disastrous recruitment of players like Malacia, Antony, Onana, and his stubbornly devotion to them. He didn’t alter tactics to suit the personnel available, and he never figured out a way for attacking patterns to result in predictable chances created; everything was Bruno pulling off an outrageous assist.
I never saw Ten Hag adapt or adjust our approach to counter something in a game. Everything was delayed and reactive. Maybe he can’t say in a presser that we were poor, but him repeatedly assuring everyone we played as hoped - when we were fecking dire - is alarming.