Meekal, re your … I am sure the runway symbol had disappeared from their ND. and … you could select and display on your ND.
Very few things in life are ‘sure’. Using the ND would be a good idea if the crew could be sure that map position was correct; we don’t know if ‘map-slip’ was a factor in this accident or not, but scant evidence suggest that the aircraft’s navigation system was not to the latest standard (no GPS) which could provide some protection from map-slip.
If the map position was incorrect and the crew used it, then this could have contributed to the accident.
Re Radar – when flying a circling procedure, the captain takes responsibility for terrain clearance, radar need not look for the aircraft; but if they do – well done. However, any safety information given should avoid confusion.
It might help your position when presenting issues to separate items, stick to facts or with supposition, provide supporting evidence or good argument.