I'd check the sources. That's not something you could just estimate, you need particular source for each name, it's too easy for AI to mess this. When I search Linkedin, I see around 400 people (40 pages) for "Civilization VI", but it includes results like "King Felipe VI of Spain Professor in Spanish Culture and Civilization" or even less relevant. I could totally see how AI could fail here with ease. "Civilization VII" has 46 pages, but with that amount of irrelevant people, it's hard to say which ones actually have something to do with it.
To get more or less reliable information, I'd go through manually. It's a lot of people, hundreds, but not thousands.