Well, Peter has always been known as a gold bug, and he obviously realized that BTC can help him be in the public eye whenever he needs it. I remember that once upon a time he said that an ounce of gold would be worth $5000, but a lot of time has passed since that and that did not happen.
On the other hand, his son allegedly chose to invest in cryptocurrencies, and I remember that they once "argued" about it on social networks, although I doubted that these were honest discussions. Those who know Peter know that he will remain consistent that gold is superior to Bitcoin, or as Buffett will say until the end of his life that BTC is a "mirage" or "rat poison squared".