I looked around his site...looks like he has alot of 'Interesting' information.
As for the comment on buying a higher Mileage car....For the average consumer I would say that is an interesting and somewhat valid point. However our cars are Collector cars, and in turn with that the average consumer would not be looking to buy one.
I think the flaw in that guy's consumer tip is the fact that for $500 or so you could do the 60k mile checkup/maintenance routine but you can never get those miles back on the 100k mile car. This is assuming the 60k mile car is in reasonably comparable shape to the 100k mile car as far as how it was driven, accident history etc. Low mileage cars have a higher value to 99% of the people shopping.