If you look at this as market manipulation as a method of generating (investment) returns, then it doesn't matter if your public lie only causes the prices to change for a day or two. As long as your people get in in the right direction before your announcement, and then get out right after the big swing, you win.

Who cares what the real price is, right? - especially when you've never pumped you own gas into your car, and you are so out of touch with normal life that you think life insurance costs $15 or $20 (I believe those were the numbers he threw out a few years ago on an interview.)