Yes, he doesn't really know how to use a computer. He was born in the 1940s, computer skills are not super common for people from that generation. He was already in his mid-50s when computers started to become common in the workplace.

I’m in my mid forties. If VR/ar devices like the Apple Vision Pro were to go mainstream, I can’t imagine myself learning how to use it effectively as a daily driver device to get work done. Heck, even the Internet, I’m pretty sure my relationship with it is more of wary scepticism than most people in their thirties.

I can see why someone who never used email until their fifties would never get fully comfortable with it.