Don't know about HR AI-bots firing workers. But only last week there was a news segment about HR AI-bots doing the first level interviewing via video-calls. Which is intriguing since there have been some reports previously about job applicants using AI to enhance their interviews, especially for remote jobs. Could lead to an AI-vs-AI showdown.
Of course, I take such reports with a grain of salt, because I often wonder whether such news items are self-serving product promotions in disguise.