infrequentflyer789, you and others may be on to a distinct problem with the THS concept. A clacker might be a good idea.
But, in the case at hand I don't think it contributed anything to the problem other than making bad a little worse. Track the elevator position from the peak of the climb to ocean surface. Did it ever, even once, go nose down rather than slightly less nose up? Had the PF gotten the elevator past neutral into ND territory the THS would have started to unwind, fairly smartly. And we'd be arguing if it had unwound as fast as it should have or whether it should have wound itself up to the stops. But the problem visible is that PF had nose up TOGA on his mind and nothing else penetrated.
That is why communications and team work are needed in the cockpit. The team members must communicate with each other what they are doing and what they are expected to be doing. (And 2 day old pizzas must be kept in stock for waking pilots out of their trances.)