No, I'm not familiar with him. I'm a little baffled by the paradox you've laid out here -- he insists people shouldn't be terrified of ceasing to exist, and yet he gets irritable if it's suggested that we don't cease to exist!

In my experience with elderly people, a recognition of the reality of life after death is a very important factor in mental and emotional health. It's not just a cure for the terror of nonexistence, it also helps encourage the old to explore their memories and make sense of their lives, and it gives them a framework to deal with the paranormal experiences that so often occur to the dying. Since there's plenty of evidence for an afterlife, too, it's only reasonable to encourage people to take it into account.