Is New Zealand not even allowing their own citizens to return to their home country?
Either way, as rich as he is; allowing a sick child to enter any country for emergency medical treatment is always the right thing to do in my books.
The whole point of the covid restrictions is to save lives, and they could very well have just save his son's life for all we know.
I am sure that the medevac paramedics and the hospital he was treated in took all of the right precautions to prevent him from spreading covid in New Zealand.
I hope his son is better now.