That author completely missed the point of working in the post.
All players use a combination of strength, agility, and footwork (plus play-making/calling and transition, but those aren't as relevant for 1-on-1 situations) to get open shots. This is a given, something we all know. A guard will use jab-steps, for example, or cross-overs, to get either open jump shots or a root to the lane.
Obviously, when the situation dictates, you would rather the guard drive to the lane than take a jump shot, because getting in close to the hoop allows you to get higher percentage shots, draw fouls, dish to open team-mates, etc. In most cases, driving to the hoop opens up your offensive opportunities more than simply taking a jump shot.
Agreed?
All people mean when they talk about playing in the post is the same principle we applied to the guard. Only we are applying it to a big man. A big man cannot start on the perimeter like a guard can, that's why you start him on the baseline, on the block, in the post, down low, whatever you want to call it. And he has to use a combination of strength, agility, and savvy to get an open shot.
The closer you are to the basket, the higher percentage shots you are going to generate. Period.
Talking about KG going to the post is no different than telling Rondo, for example, to drive to the hoop. It's just demanding a team take higher percentage shots when they need to generate points, because by definition those shots have a higher chance of generating points.
It's incredibly elementary, and whoever wrote that post is completely missing the point everyone is trying to make. His argument is the equivalent of saying Rondo should never drive to the hoop because a ref might call a charge. It's a red herring.