I don't get RBI's first explanation that you posted above. What does it mean that Supreme court has no authority over financial policies? In the later point, it said that it has no power to legalise or criminalize the cryptocurrencies.
And we all know that cryptocurrencies are not something of criminal nature, because it is neutral, and criminals are humans only. Then who gave it the authority to ban the banks and not letting people buy or sell cryptocurrencies? It never banned guns and ammunition companies, yet guns are used to kill. It never banned petrol companies, yet petrol causes the smoke and therefore pollution. It didn't ban auto companies, yet number of vehicles meet the accidents everyday and therefore about more than 1 million people die each year.
It never banned tobacco companies from dealing with the banks, yet tobacco cancer kills more than 150,000 people each year.
Conclusion is that Central bank is criminal, not cryptocurrencies, because it has the people behind it who want profits for banks at the cost of people's freedom and money.