Yeah, that's in the article. I should look at the emissions curve for various stages of red giant stars. Maybe it's a late phase red giant, and the planet was a

Yeah, that's in the article. I should look at the emissions curve for various stages of red giant stars. Maybe it's a late phase red giant, and the planet was always far away? It would need increased emissions and then they would have to start going down again. It is kind of suspicious for life to start on a planet only after the star starts expanding into a red giant, but it might be a similar handwave to the characters being human like.