He pointed that to the mining industry which powerup its mining by coal. So, as long its use green energy its ok for him. But tbh, its hard to maintain mining with that pricy green energy, so it will hard to get rid of it.
Elon already impressed with the decision that already taken by some big bitcoin mining companies to move their electricity usage to the renewable conservative energy to run their mining progress. that's why tesla already made a decision to accept bitcoin as a payment again. Elon already changed his mind again.
That guy was a mind blowing dude. Privacy didn't need to be involved in this case.