Trump is notoriously technophobic, reportedly not using a computer or email.

Not surprising, given his age. Not a big deal for the office of President, either, since the primary job of a President is to make decisions, and you don't need a computer or email for that. If Trump has time to sit down and write an email, even if he wanted to, I'd be surprised. He's got staff for that. He's got staff for dialing phone numbers for phone calls. He's got staff for cooking food. He's got staff for doing his laundry. He's got all this staff because the one thing a President has the least is time.