I don't agree with the overall view there.
The example the blog gives is: "I flash the barkeep my best smile, order a cup of ale and pay with a handsome tip and try to get him talking about the local rumours in a chatty friendly manner." The mistake in the reasoning is assuming the GM must call for a roll.
From my point of view, players don't call for rolls, the GM does. Players just say what they are trying to do. While the GM can call for a roll in a situation, they don't have to. Something might just succeed or not. What if the barkeep likes gossiping with anyone who walks in the door, no matter how persuasive the other person is?
It's also odd that they state in the d20 version of the example "the roleplaying doesn't actually affect the outcome" right after suggesting the GM give a +2 modifier to the roll for the roleplaying.