Wikipedia has a cheat sheet of well-known tells for identifying generated text. (With an appropriate warning not to over-index on minor ones as absolute proof) https://en.m.wikipedia.org/wiki/Wikipedia:WikiProject_AI_Cleanup/AI_catchphrases
Wikipedia:WikiProject AI Cleanup/AI catchphrases - Wikipedia

@0xabad1dea TIL I'm an AI chatbot.
@antsu I literally put "do not over-index" in the two-sentence-long post
@0xabad1dea Apologies, you are absolutely correct! I seem to have overlooked the advice to not "over-index" — which was indeed included in your original prompt. As a large language model (LLM), my skills will continue to improve as technology advances and my training data set is expanded, making mistakes like this less frequent.
@antsu okay okay yes you got an unwilling laugh out of me