I'll take your word that it's human written, but reading that gist, it absolutely reads like Claudeslop / GPT slop, it doesn't surprise me in the slightest that Pangram flagged it as AI when it reads identically to LLM output - this feels like a very acceptable edge case to me (assuming you are telling the truth).
Are you absolutely sure you wrote this by hand? If so it's kind of remarkable how close to an LLM you write like.
Are you absolutely sure you wrote this by hand? If so it's kind of remarkable how close to an LLM you write like.