Because of FOMO, that is why it affect the price of btc in one way of the other. Majority of the big whales of the crypto world has not really affected the price of btc in any speech or public speaking, due to the popularity and wealthy nature of these people, they move the market with just speech. We all know Elon Musk to be among the top wealthy men around the world, so, whatever he says about a product will have the public speaking. Because we don't know if the price of the asset which he talks about might move for the favour of everybody or a FUD generated to hype the asset and later dump which affects all at the end.
Now, the price of btc is around the $34,500+-, with all hands on desk, we wish for the recovering of the market.