Of course. Elon wouldn't sell without analyzing the market first. He's known to manipulate the public with his tweets, so I'm pretty sure he sold his BTC and cashed out big profits in the process. Since Elon Musk is a wealthy person, he can buy more BTC if he wants to and sell at a later time when the market turns bullish again. He really has nothing to lose. Unfortunately, the ones that will go "rekt" very badly are his followers. Those who usually invest into BTC or DOGE based on what Elon Musk says are basically newcomers into the world of crypto/Blockchain tech. They believe just because a wealthy person like Elon Musk is patronizing DOGE, means that it's a good long-term investment. But that's not really the case.
I think the media has concentrated a lot of attention into Elon Musk himself, greatly affecting (either positively or negatively) crypto prices within the short term. If this keeps up, then Mr. Musk would effectively control the crypto market to his hearts' content. Just my opinion