Would USA have had to request extradition before he reached Sweden? I would guess not. Makes sense they would not reveal that intention before, if possible. You say they secretly submitted such request, and I don't know what that fully means, but how would there be evidence if it is secret?

I mean, can we know there wasn't a secret request in play, or one intended to be issued? Their later actual (even secret? Leaked?) request certainly validates the concern, no?