Looking at the 'big picture' of this videos intent, the beekeeper has shown she has waited a little long in providing more needed space. The queen has begun to run out of room for laying as the bees are beginning to back fill the brood area with nectar 'faster' than the queen has a chance to lay in those freshly emptied cells. The hive is overcrowded and 'has over ripened', if you will lol. Therefore there is a pretty good chance the egg in the queen cup 'will' become larva, and proceed from there. Actually on another frame in the same hive, she did find a 4 day old larva in a queen cup.
If space is not provided immediately the hive 'will' swarm. In attempt to correct the problem, she provided more space. For added insurance against swarming, she pinched the queen cups regardless of being empty, with egg, or larva inside. And has vowed to return in the next 7 days for further inspection.
I agree with her reasoning for her intent. There are things I might have done a little differently, but Personally I enjoyed the video; a nice pleasant video showing what to do to correct a situation in a case as she has shown.
Phillip
PS
As a side note, I noticed she is a 'another' single box brood, 10 frame deep, beekeeper. 😊