Well, I'm more interested in his previous comments regarding the constitution being outdated during various discussions on this board through the years. That may or may not be a libertarian view. It's certainly not my view.
Mark Levin has suggested article 5 on a few occasions, and if Piezoe is a libertarian, he might get on board such a move, because it could bring the constitution up to date, especially regarding getting changes that congress will never amend for themselves, such as term limits. I believe Mark is referring to the below portion of the article...the states.
From article V:
...or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as part of this Constitution, when ratified by the Legislatures of three fourths of the several States,...