Why Meta AI text sounds machine-made
Meta AI answers directly in a chat in WhatsApp or on Instagram, so the output tends to be short and friendly, often with an offer of further help at the end. In a conversation that is fine, but in a post or an e-mail it gives away where the text came from.
Longer text from Llama or another Meta model has the same marks as text from other models: sentences of similar length and generic turns of phrase.