AI Chatbot is now Writing Papers

I was reading an interesting technical paper by a research team at OpenAI, and it ended with:

8. Acknowledgements
We would like to thank everyone behind ChatGPT for creating a tool that helped provide useful writing feedback.

What? Did ChatGPT write the text of this paper?

OpenAI is based in San Francisco, and most of the team has foreign sounding names. China, India, Korea, Russia. They seem to be implying that that they used an ai chatbot to clean up their grammar and word usage, at the least.

ChatGPT is an OpenAI product, so maybe they are just eating their own dogfood, as Bill Gates used to say, or they are just plugging the company product. Nevertheless it is unusual to so openly credit AI for a research paper.