I refuse to believe that this crew was not familiar with OFE / QNH operations nor that there was anything wrong with the plane that crippled it in such a way that prevented the crew from making a normal approach.
I believe it is more reasonable to believe the reasonable and that is that the crew was under a lot of pressure from behind.
We all know that on a NP let down it is crucial to make a rough crosscheck between Baro and Radio altimeter.