AI voice is actually just the voice of the millions of non-native English speakers that were mined for human reenforcement during training.
For me to peg it as AI, there needs to be a reason for existence (ad, propaganda, trolling, etc.), and at least 3 of the markers. Em-dash, rule of 3, "not x, but y", excessive emoji, or a clean conclusion sentence/paragraph.
Also no edits! No one ever edits an LLM post.