The automatic announcements drowned out the first one, the crew didn't see anything (sorry that don't wash, when it's dark and you're concentrating on touchdown point, chances of seeing anything else is small) the crew discussed the second call and decided it wasn't for them - what about "if in doubt ask"
Where are the recommendations regarding all of this?
Next time you send someone round will you really expect them to pull up now?
The sounds on a modern flight deck nearing the ground are too many to expect an R/T call, however urgent, to get through.
Between all the EGPWS calls (Rad Alts, Minima), SOP calls, Airbus "Retard" let alone intercom chatter, some of these get missed. I am only subconsciously listening for an ATC call, since "Cleared to Land" is the last call I expect. A strongly worded call like used in the UK, presumably introduced as a result of experience, stands the best chance (repeated, emphasised) of getting through and not getting drowned out.