The post is remarkably devoid of any content and just a series of assertions. So, as you said, its the same take rehashed.

But apart from that, bitcoin and the concept of cryptocurrency are conceptually not that difficult. And even if they were, their value is not due to their technical novelty but due to their fundamental nature as financial instruments.

If Warren Buffet is warning against them, we do need to look at them and try to understand what is the problem he sees. As he knows more than most here about financial instruments.

The risks need not be technical in nature at all. For example, governments could fail to recognize cryptocurrencies as valid contracts thus voiding the benfit of legal systems. So, you own tokens of a house? Good luck enforcing that.