You've quoted that article and you don't realize that the law is the government.
If they pass a bill saying bitcoin is illegal, then by the authority of the law your fundamental right is toilet paper.
Not exactly true, in my opinion. It would be true, of course, in a country that did not sign any international conventions and has rules that make it easy to change the Constitution, but India is not like that. I am not sure about the Constitution in India (in my country only 2/3 of the Parliament can make constitutional changes), but India is a subject of International law. For instance, India adopted the Universal Declaration of Human Rights, and, if Bitcoin is property, then Article 17 has something to say about that:
Article 17.
(1) Everyone has the right to own property alone as well as in association with others.
(2) No one shall be arbitrarily deprived of his property.
If it's about the right of occupation, then there's Article 23:
Article 23.
(1) Everyone has the right to work, to free choice of employment, to just and favourable conditions of work and to protection against unemployment.
International law stands above the national one, so it is possible to appeal to these rights. Not everything can be done by a strict government. Banning cryptos probably can be done, though. But for now it's still a project law, right? So maybe nothing bad will happen.