You are correct for the BMW designed Range Rover which no longer has a box section chasis and so would not provide as much survivability, since the past 2 years. However, it was relevant for all the English designed RRs which did have box section chasis up until fairly recently, plus of course air bags..
An even compared to a 78 S280? or whatever the S class of the day.....we would not likely have fared as well is we did >This 25-year-old anecdote is of no relevance to cars today.