You're ignoring the interesting questions he asks in favor of the easy to hand wave away stuff and that's exactly what I'm talking about. To be clear, I'm not defending the things he says. I'm pointing out that his more outlandish theories gain more traction because the scientific community doesn't lean into the softballs and use them as an opportunity to both teach people actual science and understand what different groups of people want to learn about.

Ignore the star / soul example and focus in on the possibility of an ancient and semi advanced civilization existing. That's the part grabbing people's attention. Talk about what that would change about our understanding of the past and what sort of evidence we would expect to find if it were true. Showcase people working in related fields and what they have found already. Propose other locations we could look for that evidence and discuss other topics we could study while looking for that evidence in those places. Engage the curiosity, don't dismiss it. Anyone listening to Graham is likely uneducated in science but interested in it so use that as your jumping off point instead of judging those people for not being farther down the path.