I am not a lawyer but I have had quite a bit of experience with lawyers and I am well aware that on any subject you can find thousands of lawyers who will take one side and thousands again who will take the opposite side.
So what is you interpretation of this?
Oh yes, the supreme court has ruled in very specific language that the Constitution can not be changed by any means other than changing the Constitution itself and that only by the methods outlined in the Constitution. Congress can not, presidents can not.
And a magistrate judge is not a judge by the standards set forth in the Constituion. A magistrate judge is really no more than a magistrate with a fancy title.