Cant determine whether this is a PR piece or actually sound “investment advice”
Just because it's PR doesn't make it wrong. Yes, he profits if you do what he says. But... so do you!
I am always cautious when people share "their secrets" with the rest of the market.
I am not saying it's wrong but I have been in cryptocurrencies long enough to know it's not as simple as it might look.
I would be skeptical of the ability to short this market substantially since those who came in very early and at very low prices hold quite a lot and can afford it to go way down yet and thus will be long on this if need to.
That's also just another theory we have no way of knowing whether is true or not.
So only time will tell.