Couldn't it be just another manipulative movement from Elon Musk to play with market's prices? He expects to be followed by big investors on his steps, so when he announces he is going to sell bitcoins or has sold bitcoins, others will simply do the same, dumping the price even more, therefore Tesla and Musk can buy bitcoin again much cheaper and increase their holdings, wealthy and influence.
No, it's not enough to do anything to the market and it's already been sold.
Could be dozens of reasons:
From they want to expand in China and as we know China is anti
BTCAs others have pointed out could be a large investor / fund wants them out of the financial market so to speak and in the car building market.
Could be they are worried about something and they want to sell now so when they spend the money it does not look like they are selling because they had to.
And so on. It's less then $1 billion US so not that much in the overall
BTC market.
-Dave