The blog post demonstrates that a LLM plays chess at a decent level.
The blog post explains why. It addresses the issue of data quality.
I don't understand what point you thought you were making. Regardless of where you stand, the blog post showcases a surprising result.
You stress your prior unfounded belief, you were presented with data that proves it wrong, and your reaction was to post a comment with a thinly veiled accusation of people not being educated when clearly you are the one that's off.
To make matters worse, this topic is also about curiosity. Which has a strong link with intelligence and education. And you are here criticizing others on those grounds in spite of showing your defitic right at the first sentence.
This blog post was a great read. Very surprising, engaging, and thought provoking.
I can’t imagine any programmer in this thread would be entertaining a more complicated scenario than this. You can substitute chess for any formal system that has a reliable oracle.