Anyone could hold and decide for their holdings but as for me, Elon's statement would help any of us. Maybe he's trying to tweet things about crypto again because he wants to manipulate the market through it which isn't possible anymore because people are now skeptical and learned from what he did to Doge before.
From his tweet he said that he is not going to sell any of his cryptocurrencies whether it is Bitcoin or Dogecoin. He’s going to continue to HODL them for as long as he wants I guess. So far I don’t think that he has sold any of his coins and it is possible that he will continue to hold for long.
It doesn’t matter how long he decides to hold one thing for sure is that it wouldn’t affect him at all because whatever investment he has made is something he can afford to risk in the market. Bitcoin is also going to continue to increase in value and we all know that. But, I am not trying to take any investment or trading advice from Elon Musk, I just do what I feel is right for me.