Tamil Nadu in 867

Hello everyone! Non-Indian here. There's a video game I really like called Crusader Kings 3. In that game, the area of modern day Tamil Nadu is shown as one of the most developed places in the world in 867 CE. Can any Tamil historians describe in detail how accurate this is? And if it is completely accurate, how did Tamil Nadu come to be so developed in 867? I asked this question in r/AskHistorians but unfortunately I got no answer. Also please cite your sources as I know that no one can describe something this complex in a Reddit post and I would love to read more. Thank you! Have a good day.