I would say no, now i dont think you could stand on your pinkie finger like that, firstly balancing it would be impossible since it woild like trying balance a pen on its sharpened emd.
If he supported with himself with his feet from the ceiling, which he might've done, hard to tell.
Second problem ks that i doubt the pinkie finger can take that much force, the way it is hyper extended puts incredible amount of stress on the joints. So i doubt the finger could handle that much force, maybe if he was super light, but he doesnt look light at all.
Now the same with 3 finger, one being thumb, i think is completely possible.
Fingers are quite weak, i have injured my tendon and joints before pulling too hard while rock climbing. I dont think i have ever heard anyone half crimp, so basically hang from the around the tip of the pinky one handed.
I know videos of people doing it from lower on the finger. But that kind of finger position would be even harder and more stressful for the finger.