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?
Yes.
After the pilot has signalled the need for this service by going around, flying deadside at 600', waggling his wings, and squawking 7600 (if available).