I've heard that it's so addictive that people who stop using it will die from withdrawal in a matter of days.
It really depends on the kid and the complexity of the message. Young kids are still learning the intricacies of the language and building a vocabulary. Not talking down to them helps build those skills up. But at the end of the day, if the message is not getting across, it's the fault of the communicator.
Plus it's an annoying flex to say "see how amazing my kid is? It's all because of me!" Some kids just pick up language easier, some kids sleep all the way through the night earlier, some kids toilet train easier, etc. Usually it's better for parents to quietly take the little victory rather than treat it as a reflection of their amazing parenting skills.
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.
Since that's Charlie Chaplin doing a mocking parody of Hitler, what do you want to stop? People making fun of Nazis?