Give me that style guide and spread it around then!
It's the overall structure of the article, the cadence itself, those short punchy sentences, negation. If you want some better evidence, Pangram flags 1/3 of this article as AI generated, but that's because they'd rather have a false negative than a false positive.
If you want another funny evidence piece, see https://lab-stack.com/blog/dgx-spark-memory-hard-wall/ - a random article I found by direct phrase search. It has a similar structure and "My initial theory was simple" word for word.