See, this is why someone is going to jail. This explanation is wrong. Someone lied to you, and they probably lied to you to make this look like a sure bet so that you'd buy (and thus pump) a stock that is otherwise going to crash, so that they can unload their position before it does. You got scammed, and the person who did it is guilty of a crime.

FWIW: Short leverage higher than 100% is not naked selling. It just means (as an example) that you borrowed a share, sold it, then later on that buyer loaned the same share back to you, and you sold it again. This is not a good idea, but it's not naked selling (which is itself securities fraud).