Elon is a businessman, so of course he cannot predict his steps to make a profit. It's true that there is no guarantee that Elon Musk will influence people to buy doge so that the price of doge will rise, but remember that Elon Musk has already done it. So the possibility of it happening again is there
It is true that Musk cannot predict many things (contrary to what many people believe, he does not have a brilliant mind) but he can manipulate, which he has done on several occasions. Every time Musk said something on Twitter about Doge, as happened a few years ago when he said that Tesla would accept Doge as a payment method, the economic value of Doge increased considerably. The ironic thing about that matter is that it was not to buy the brand's cars, they only accepted Doge for merchandising. That is a clear example of massive manipulation. It doesn't matter if Musk is a businessman or how much money he has, we always end up knowing the truth.