It takes about 10-20mins to cook fish in a frying pan on med-high on a stove. Boil water gets 115-120f* and boils 5-10mins
So that means he has to produce more than 230-240f* to cook the fish in 1min. It also means his body temp would have to be that high when at 115f* your internal organs start to fry. It is easier to belive it is a trick then to believe he has a special Qigong technique.
But maybe it does exist after all. But in over 10years of studying Qigong I have yet to see any of these claims used by actual Qigong practicers.
Who knows maybe in another 20 years I will see it.