Wow, looks he really got you, OR..! The Magisterium is the “qualified expert”. And what is the Magisterium but an Expert Speculator with a Vatican t-shirt and Rome Decoder Ring?
The Magisterium is much more than that. It is the teaching authority of the Church. It consists of all of the bishops of the Church including the bishop of Rome (Pope) and to a large degree all of their predecessors. They are collectively acting under the direct authority of Jesus Christ who promised to protect the teaching of the Church:
"He who hears you, hears me; he who rejects your rejects me, he who rejects me, rejects Him who sent me" (Luke 10:16)
They are under the guidance of the Holy Spirit through Apostolic Succession. Remember no bishop exists, or has ever existed who has not had the hands of a bishop placed upon him during ordination. This is a direct line directly to the original Apostles.
God did not take them lightly, they do not take themselves or their duties lightly, and I shall not take them lightly either.
The "Magisterium" is the refuge of last resort when all other smokescreens fail.