Did you deliberately ignore the 'at late 90s usage rates'?
In the book he took then proven reserves and divided it by total oil consumed by mankind up to that point and the answer was in 1000s of years not 10s.
His point, and mine, is only that we're not running out of oil on any time frame that need concern humanity now. We have only been using oil as we currently do for about 130 years. Look at the changes in technology we have seen since the late 1800s - does anyone seriously think we will still be using oil the way we do now in 100 years time....let alone 1000yrs?
I don't actually care what mankind will be worrying about 50 generations from now. Nor do any of you if you're honest.