While the article states that other languages were evaluated, it seems as though the project was motivated entirely by the author and the evaluation was just paying lip service to what was basically a foregone conclusion. Don't get me wrong, I like D from the small amount of playing I've done with it -- and maybe it is the best tool for their purposes -- but this doesn't strike me as an impartial evaluation. The need…
The biggest problem is they have engineers who have turned their hands to programming, one would expect, without the formal training and so have latched onto various antipatterns without knowing any better because Pascal allowed them to get away with it - painting themselves into a corner. He mentioned an awful lot of code that would have to be refactored, and it could be that they are just too far down the rabbit ho…
That solution is probably the lowest cost / safest course... Assuming the Extended Pascal compiler they have supports it.
But I suspect choosing D was a fait accompli.