This is consistent with Rob being marginally literate. We know he doesn't read or prepare much if at all and can only speak from notes written in big type with lots of boldface. People who can't read or have a learning disability find jobs where they can talk a lot - like sales careers. Rob's principal work tool is his phone. Has anyone ever seen him use it to text?
I've worked with people with literacy and learning issues for many years. They actually adapt to computers really well, so I'm not buying that as an excuse for Rob. The man is in his 40s, I'm older than that and have been using computers for a long time. They aren't a novelty. There is no valid reason why he would not have logged in at least occasionally over a period of months.