FWIW, that is 100% a retconned explanation. No one anywhere was talking about this theory until the last week.

It's clear that Trump demanded tariffs, tried to do it once early, and got cold feet. What happened with Lutnick et. al. is Court Politics. They saw an opening to improve their own status by selling a creative lie that would allow Trump to do what he wants. So he bought the lie and picked new favorites.

But it remains a lie. No one serious thinks that this is a good idea.

Also: refinance the debt?! First, no, that's not how federal bonds work. They're a contract and you pay the interest it says on the note. But even if you had a magic money pool around to do buybacks or whatever... most of the outstanding debt is in 30 year notes at like 3%! How low do you think they're going to get the Fed to go?