Economic inefficiency is a problem of the current monetary system, caused by its centralization and inflationary nature, and this is the problem which bitcoin is trying to fix. Most of the issues in the world today are caused by our current monetary system, from wealth inequality to consumerism and environmental problems.
He is suggesting that the monetary system should be even more centralized, and we should move into even more centrally planned economy, like in Soviet Union. This time however, they're planning to use big data to solve the economic calculation problem and to control consumer behavior. This is completely immoral, and ends up destroying both personal and economic freedoms in a society. This problem is very well understood, and no one seriously suggests central planning unless they are evil and want to decrease freedom and equality in a society.
We already have too much central planning in our current system. Central bank digital currencies would be the last step in this process of completely monopolizing money, and giving governments and central banks the absolute authority of where money is invested and how it is spent.