While ridiculous its not really that hard of a thing to do given enough practice shots. I don't really know why he would fake it, but the camera angles and shading in many places are frankly just awful....
There isn't a lot of luck involved... your hitting a flat surface with a relatively even bounce factor at an unchanging angle, do it enough times with a system to determine how hard to throw and what part of the surface to hit and you will get it "down" to where your close every time, tape until you hit it, splice footage and done.
A good example if you play pool... There are some combo shots/bank shots that when your not an expert are probably a 1 in 5000 chance of you making it on the spot. But if you set the exact shot up 30-40 times in a row, by the 20-30th time you try it your suddenly down to a 1 in 10 chance because its a totally static environment and you can slowly adjust how hard and what angle to hit the shot at. If you cut too much you slow back the angle down, etc... the same goes for throwing a ping pong ball against a wall or a chair.
If you have to do it simultaneously though its nearly impossible unless you have done it before because you have absolutely no idea exactly how hard to throw/hit it, and its very hard to "guess" the angle perfectly.
Are they neat... sure, but as the page points out this guy simply has way to much time on his hands.