Well, yeah don't think that is strange, if you eliminate stuff like aging and sickness, a random thing like a traffic accident (interesting he picked bus, and not a general traffic accident, or the more common car as a way to die, but the mega rich do hate public transport) will take you out.
There prob is already a science fiction story where a society of near immortals become mega risk averse because they fear falling down a stair and breaking their neck.