Technically the shots you don't take is infinite.
Let's say we are on an NBA game, there are plenty oppurtunities for everyone in this world to shoot the hoop, including on the other side of the field or even in the hospital. The problem is further from the hoop, the less likely it is going to go in. There are infinite shots not taken knowing times can be divided infinitely and one shot is only one possibility.
Upon this problem, per every shot you have infinite shots not took.
So we have this: Per infinite theoretical shots, there is one shot taken. Thus, the shot takes 0% of the total pool of probability. However, knowing I am a very bad basketball player, I could miss a shot I don't take consider in the same situation I have seen a senior player shooting it in when I did not even take the shot.
So we got one thing: A shot that we didn't take can still be possible to be in, thus semantically this saying is false. You didn't to it does not mean it is impossible. If so, then I would tell everyone that being a billionaire is utter bollocks.
Define take and after seeing the definition, it would still make this saying false. If the basketball just moves by itself, then it goes in even if you don't take it. Since the saying says the probability of the ball go in when I don't take it is 0%, then this also implies I take part in 100% of shootings, which is false. Not every shot I didn't take is missed.