I respectfully disagree.
Remember that Church official who was captured on tape telling the bishops how to deal with sexual misconduct claims?
And remember how he said if a bishop came across really bad stuff, he could always send it to the Church agency with diplomatic immunity so that it would never be disclosed (the Apostolic See?).
That is exactly what the Pope is doing here.
They don't need to send him to Rome to remove him from his position. They can just tell him to retire---maybe they can even support a claim of a health condition which mandates retirement.
And, remember, the Church has been fighting this deposition for a long period already.
The Church needs him outside the jurisdiction of the local courts. If he makes a clean getaway, there is no way the Church flies him back to Boston for depositions. He knows too much.