C’mon man. They’re not wrong about PV tuning. Lots of different tuning philosophies out there, and they don’t all apply to every build.
Their method of selecting a PV is a recommendation of where to START tuning, not where to end it.
And it’s meant for the average user. Hell some builders will put a plug in the PV and do all the carb tuning with the jets. Good way to lose gas mileage and run rich at cruise on a street car, but for a car that’s always wide open on the drag strip that’s not a problem.