If he deeply cared about his Bitcoin investment, he wouldn't spread FUD about it in the first place. There's a rumor that big Tesla shareholders became worried about his Bitcoin purchase and how it would reflect on them and Tesla as Bitcoin is being branded as "ecological disaster". So he was forced to denounce it, and he doesn't care about Bitcoin and his 1.5 billion deeply enough to oppose those shareholders. He's afraid of them dumping Tesla stock much more than losing on his Bitcoin bet.
Anytime from now on he can come to his twitter and say something positive about bitcoin again, like it's not harmful to the environment anymore or that miners are fastly shifting to renowable sources of energy. The point is, does it worth for crypto community to become hostage of a man's tweets which portrait more volatile opinions than the crypto market's volatility itself?