ideological beliefs about the nature of money (liberals not interested in non-state currencies, and Austrians believing that currencies must have intrinsic value)
https://unenumerated.blogspot.com/2011/05/bitcoin-what-took-...
https://unenumerated.blogspot.com/2011/05/bitcoin-what-took-...
AFAIK one of the main underpinning of the Austrian school is: https://en.wikipedia.org/wiki/Subjective_theory_of_value
Although to be fair a lot of non-scholarly "Austrians" cite the intrinsic value of gold as what makes it superior to Bitcoin. So he's right in the parlance of common rhetoric.
I also think he is right in that liberals tend to favor keynesianism because it makes it easier for the government to grow.