I don't see why not, at least for most things. If you want to use skills like the shopping list without access to the 'written' shopping list things might get complicated, stuff like that.
If you do the initial setup and handle any additional changes/new skills/new smart things etc, he should get plenty of use out of a dot for sure.
It's kinda like the dot I set up for my mother, my father can access the alexa webpage but he doesn't need to I can do most things remotely.