Let's see:
They were low, waved off, came back around, and landed safely.
In a generic sense, they did what was needed. Perhaps the "29.97" alert from the controller put a finger on what was wrong; perhaps they needed a 'poke' to get back into the game, perhaps something else was going on.
As it works out, what should have happened did: low on approach, wave off, come back and do it right.
That's why there are so many pieces to the puzzle: planes, pilots, lights, navaids, radios, controllers, etc. Extra slices of cheese block the holes from lining up, so to speak.
If the controller saved the day, a tip of the cap to him.
He may have made the call about when the crew realized "this is AFU, let's go around" ... hard to say without input from the crew on what they saw.
How one gets that low on approach that close in is another question.