The re-identification is done by ML, at which point it's basically undetectable. If you give all this day to, say, and LLM, and the LLM also has your blog, the identification is embedded in the weights.

I can ask "Tell me about Person A's experience with airlines" and it will tell me. Or I can ask more generally, "knowing your knowledge, derive a no-fly list", and then it's likely Person A will be on it.