What I am saying is whether this is unconstitutional or not isn't up to us to decide. Whether action is lawful or not will be decided by the court & verdict will be made by Court. As of now, those who are saying this is unconstitutional have a fragile ground. There is no insult to Supreme court if parliament make or change a law . SC's duty is to interpret and make sure that everyone is following the law and parliament's job is to make law for the peoples based on their democratic mandate.
You are correct in pointing out that as long as an action didn't violate the fundamental rights, Parliament can pretty much override it with new law. However, if the parliament passed a law that SC finds to have violated constitution, and parliament passed law to override it, SC can still strike it down & that will cause constitutional crisis. In that case, either president have to dissolve the parliament, suspend constitution or Parliament have to impeach SC judges. And that would be an insult.