Can we say we're both right and wrong? There is no hard and fast answer to 'do x to get x' when it comes to tyre pressures as it will depend heavily on the car, type of tyre, where your pressures currently are etc...
Using your pyramid, if you're on the underinflated side of it on your fronts (i.e. under the peak grip), increasing them increases their grip relative to the rear i.e. cancelling out understeer/possibly to the point of inducing oversteer.
Other way still stands. Assume your fronts are at peak grip, overinflating your rears to reduce grip and suddenly you have a oversteering car.
As for those sites...
https://www.facebook.com/notes/ultra...0134442380550/
http://www.trackdayguru.com/tyre-management.html