All except last "football" move can be done with good training.
Friend of my best friend know how to juggling bottle or bottles. He can even do that without using his fingers. About gravity and knife speed, everything depends of weight, material and knife dimensions.
That small knife was thrown up, and it dropped like it had 30 kg, so yeah, keep trying to find reasons to justify fake as real, maybe you succeed.
As for your video, those are obviously real, since they are pathetically easy and done infront of a live audience who wouldn't watch like a bunch of clueless perplexed retards in awe if what those nabs were doing wasn't impressive in the puny brains of the said clueless perplexed retarded in awe audience.
Have a good one.