Tee Emm, the point being questioned appears to be the awareness and realisation that something is not as required. Speaking up, challenging, and intervention are options of what to do after the ‘monitor’ has been triggered.
Exactly. This is the same flaw he makes in the "CRM is useless" debate so it's not surprising he repeats it here. In the first instance CRM is not about changing anyone's behavior; it's about changing their mindset. Whether that change in mindset changes the flight crew's behavior all depends on the specific circumstances. In many case, even the majority of cases, it won't change the behavior of the flight crew at all. That doesn't mean CRM isn't working; it precisely means it is working.
The same thing with the idea of monitoring. The difference
safetypee is trying to articulate, if I understand him correctly, is the difference between active and passive monitoring. The difference between these two states isn't the difference between whether the PM intervenes or not; it's what is going on in the PM's head. In many, even most cases, the difference between these two mental states will have zero impact on the flight crew's behavior. But when things start to go awry the difference between active and passive monitoring is stark.
Safety doesn't start with the hands; it doesn't start with interpersonal interaction. It starts with what is going on in the minds of the crew. The hands and the interpersonal interactions flow from the mind. That's the key point of CRM and a key reason there is even a PM to begin with.