... any pilot so tunnel visioned as to be unaware of the configuration and speed to the extent that he was ...
I very much doubt that he was
unaware of the aircraft's predicament.
I think the far more likely explanation is that he was aware that he was "outside the envelope" but because he had gone outside the envelope before, and gotten away with it, he could do so again.
I don't know whether this is true or not, but I certainly think it is the
far more likely scenario.
Which, of course, implies a history of gross SOP deviations and breaking of rules.
If you could have asked this captain, whilst on the approach, "how are we looking?", I think he would have said something like:
"Not the best - we're high and fast - but don't worry, I have done this before".
And whilst he may have gotten away with similar on previous occasions, this one was just that little bit more difficult, but he had succeeded, this would have been his new "benchmark".