Do you want to be able to have them ‘subscribe’ to the show in their podcast app of choice?
Is it only audio that stands alone? then you don’t need an RRS feed
Do you mind using privacy by obscurity vs secure?
I have a private podcast for my mentorship, and it’s basically a libsyn account, without submitting it anywhere and giving them the RSS feed (private by obscurity)
vs
The Libsyn Podcast App which is secure – you get an app and that content is only available via that app and web portal.