A go around is made with the gear down. You only raise the gear when you have a positive rate of climb. This was done at very low altitude with the gear up and passengers on board.
Worse it was done with his boss on board. How tactless is that? He may or may not be impressed - but why take the risk?
This was unauthorised. The captain made a bad decision. It would not be the first time that management (of any company) has sacked someone for doing something questionable when management could be questioned subsequentally if they did not sack him.