Could be ‘confirmed to be false’ I reckon.
Could be. But "confirmed" is a positive word, an affirmative word. If whitehouse.com wants Sinclair to pass - - and I think that's the result that would serve them well - - then they need to have a positive result "confirmed".
On the other hand, if Larry failed, then whitehouse.com would NOT want that result "confirmed", they would want that result "reviewed", "evaluated", re-examined", etc.