Framing this as whether he can convince you the mistype was accidental gets it backwards, and "would I believe X or would I think Y" is preponderance, not reasonable doubt - entirely different standard. Reasonable doubt doesn't ask which account you find more likely. It asks whether the innocent one is unreasonable.

Take the hypothetical as posed: duress code one digit off, entered while detained after being interrogated for hours, and repeatedly pressured to unlock. The government has to prove beyond a reasonable doubt that he knowingly triggered the wipe and did it for the purpose of impairing the seizure. Nothing about that scenario makes mistyping an unreasonable explanation unless there is more circumstantial evidence that indicates him intentionally providing the wrong PIN.

Proving that to a jury looks very hard.