If you were sitting on billions and wanted to accelerate climate change then investing in BTC is probably the most inefficient way to do that. I doubt that idea ever even crossed his mind. It’s just about the profit.
I'm only trying to explain to you how I understand the original post, and it has nothing to do with my own opinion on the subject (which may/or may not be the same).
Of course it's just about profit... the point is that he should be aware of its environmental impact and the hypocrisy of his investment therein.