He really likes to be unreachable - he's known to disappear into the wilderness to fly fish for days on end, and no one knows where he is.
I'm sure he has an assistant, but he doesn't sound like the kind of person who would want an assistant following him around all day like some kind of butler/valet.
Speaking as someone who knows more than a little bit about Patagonia and its owners, you couldn't be more wrong.
Fair enough. I just expect that if someone needs to talk to Yvon Chouinard, a phone will absolutely appear even if he doesn't "own" a phone.
Why? Being inaccessible for days is many peoples dreams.