You are placing too much weight on constitutions. They are just temporary documents a sovereign state can rewrite at any time for any reason. Either by the process established in the existing constitution. Or by having a civil war or a revolution, with the winners deciding that the old constitution is void, because its supporters lost.
I think there’s a difference between human rights and legal rights. For instance people in North Korea have a right to freedom of thought, all people everywhere do, but that doesn’t mean their government recognises that right, or that they have the legal right. India, mind you, doesn’t have the legal right to block me from viewing this Wikipedia article in Australia, but it seems like they have the ability to do so.
I guess ultimately this comes down to whether you believe a government and the rights it enforces is legitimate because it has the biggest guns, or because that government was decided by the people, or the legitimacy is determined by the ethics of the government etc
