I am curious about how this works. Did you have to set some specific toggle to make it available on Apple Podcasts for Apple devices only? Or is this the standard flow for making a podcast available on Podcasts app? How do the other podcasts on the frontpage that are available for downloading on other devices do it?

Tangentially related, I wonder why it says "Apple Podcasts Preview" at the top of the page. Could it be that the app is just in the preview stage and just started the rollout with Apple devices first, with the support for other devices coming later through a web version (i.e., similar to how it was with Apple Music on the initial launch)?