I wouldn't take that advice too seriously. I roughly agree with the grid philosophy of assigning everything a place, but many of those statements I would disagree with. (At least when applied to a normal mixing session). For general advice on programming a General Midi box, this is fairly good advice. E.g. - recommding only one reverb over the whole mix is dodgy for serious recording. But if you are limited to only Roland reverb, I tend to agree you should be very sparing, and not mix multiple instances of the same.
You have to mix with your ears first. I like to use a spectrum analyser of a whole mix, to aim for a flat curve. Even then, you need to know what 'flat' really means - maybe a 3 or 4 dB per octave slope. A good spectrum analyser will let you choose.