In my opinion, all sports shooting is according to the rules - with one hand, not only with air pistols. This girl also shoots at a distance of 25 m, from the Pardini SP. 22LR.
By the way, it is better to shoot from army pistols with one hand, this is a more flexible position. I also always kept my left hand in my pocket so that it wouldn't hang out. You can also hold on to the waist belt, behind your back. And the recoil can be tolerated.