That's because Ken Rockwell is a ****er and aside from his article on Colour Spaces his entire site is full of rubbish, poor advice, and often downright misinformation.
You would do very well to start reading something else, there are plenty of other good sites on the net which carry real equipment reviews not just a blind opinion of a guy who at worst has never used the equipment, and sites that have proper informative photography guides too. e.g. the luminouslandscape
There are occasions where all metres over expose and the D80 is no exception, but to run around with your metre at -.7 permanently is just stupid.