James Miller is the author of this top-level post.

Thanks, that underscores my difficulty finding relevant details.

I think you're saying the relevant detail here is the applicability of anthropic reasoning to the universe we actually live in: Actually using the island argument doesn't help us learn about the real world as much as looking up historic data about islands, and the SIA doomsday argument fails similarly in the face of real-world astronomy. Is this correct?