This is nothing short of a complete loss of Situational Awareness. That, IMO, is a total disgrace.
While I agree 100% with your sentiment, I am reminded of when my training as an Air Accident Investigator started 30 years ago. (It was a union position at which I jumped, and have taken many years of courses since).
One of the instructors said "start from the point that the pilots are not idiots". The idea being that if they were idiots, the investigation could stop right there.
So when I see an incident like this, my thought is always leaning to what series of events and what series of occurrences led them to that point. If they are still alive, one could just ask the pilots. If they are not, then you have to put yourself in their seat and imagine the series of events. The problem with asking the pilots is that one has to remember they are trying to keep their jobs, not to mention in some countries risking legal discipline. So ... go back to imagining you are sitting in their seat, and go from there.
And, like your sentiment, I can't figure it out. No pilot would go below MDA without visual confirmation. So they must have seen something. Then, in reduced visibility they got two EGPWS warnings ... why not go around? Why did they wait 9 seconds. (Standard is that action must
be completed within 5 seconds of a warning). Why did they disconnect the autopilot so far back? Why didn't they refer to the displayed VNAV/LNAV info they readily had? And lastly, how could anyone see less than 100' on the radio altimeter without concrete under them???
Remember, it is very easy to sit at one's desk a year later with all the facts and point fingers, but this one I don't get. And you are right, Situational Awareness was lost. In today's age of IRS/GPS navigation backed up with EGPWS, that's hard to do.
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!