You have to understand that Comey is "of a certain age".
He's been a US Attorney for most of his career, and probably is not entirely comfortable with computers and their nuances.
"Important personages" in law and the government usually have "people" for dealing with computer stuff.
They don't get their hands dirty with minutiae that is reserved for cleanup by their peasant minions.
Yet many of us old coots on FR have no problem with them.