Ha! Despite the fact that I tend to proof read my posts before publishing, right after publishing, and sometimes re-reading them few months after publishing, I still tend to not notice some obvious typos. Kinda makes you feel appreciation for the profession of editors and spell checkers. (And yes, I use LanguageTools in neovim, but I refuse to feed my articles to LLMs).

Or the user has "ChatGPT, add random misspellings so it looks like a human wrote this" in their system config.