Unfortunately that doesn’t really mean much.

Sure he can’t be elected to a third term. He could be elected VP and ascend back to the office though. There’s no bar on that. That’s why they’ve already publicly been floating that.

He could be elected speaker of the house and be second in line for the presidency.

The only argument you could really make is the clause that

no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once.

Means he’d be ineligible to act as president even, because he has already been elected more than once.