Great post! You are absolutely right in saying he is a conservative investor. He is famously quoted as saying:

Buy a stock the way you would buy a house. Understand and like it such that you’d be content to own it in the absence of any market.

He is not going to condone a high risk investment such as crypto and was (as you mentioned) probably right in predicting its unfortunate end... I mean anything with this much volatility cant be considered sustainable.