Not on this article, but everywhere nowadays are hints of AI. For example using emoticons on the beginning of each sentence or never really going deep into the topic. The complete lack of grammatical errors is another tip, unless the prompter asks to write minor errors and pretend to be a human.

Wouldn't be suprised that before the end of this year we see more website declaring themselves to be "human-only zones", considering we won't be able to match the speed and quantity and replies from bots. Making it difficult to hold proper conversations.