Is the constitutional amendment a law within the definition of Article 13 (2) of the Indian Constitution?

In Shankari Prasad Singh v. Union of India the Supreme Court ruled that Article 13 refers to a ‘legislative’ law, i.e., an ordinary law made by a legislature but not to a ‘constituent’ law, i.e., a law made to amend the Constitution. The word ‘law’ in clause (2) of Article 13 (2) did not include law made by parliament under Article 368 of the Constitution.