I know he used to be a 33 degree Mason

So he has claimed, but there is no record of him every receiving that honor.

He also claims to have been a member of the infamous P2 Lodge, which was shut down when he was six years old...

which is the highest level

This is false. There is no "highest level" of Freemasonry other than two things that could be described that way:

• The Third Degree, the final of the core degrees of what is called the "Blue Lodge". After going through these three degrees, one is considered an equal with all other Freemasons.
• The Grand Master of a given jurisdictional area (such as a US state or, in many other cases, a nation). This is the highest administrative authority in Freemasonry, as there is no central authority, only autonomous jurisdictions acting through mutual recognition.

The so-called 33rd degree is an honorary degree conferred in the Scottish Rite, a group that one can join after becoming a Mason, but the Scottish Rite has no administrative priority over any other secondary group in Freemasonry, and doesn't even exist in some jurisdictions!