@piperarcher: even if I do realise it is easy to judge from a distance, and with plenty of time available for thought, still I think the main issue was the landing at a runway with an aeroplane on it. Radio or not, that is a grave offense; and rightly so imo.
On top of that, not receiving any kind of comm's on the supposed tower frequency ought to have raised some kind of questions, and switching back to the approach frequency would surely have brought a degree of improvement. Why wasn't that done? The radio excuse seems feeble, sorry if that sounds harsh.
But I admit it is easy to judge from a distance - I won't, but I do wonder.
BTW the report doesn't mention the use of light signals - aren't tower staff supposed to clear the dust from their Aldis lamps in this kind of situation? Aldis lights are (or at least were at some time) mandatory equipment, ISTR?