I think it's relying on https://podcastindex.org rather than polling RSS feeds directly.

That index might be adding some Podcasting 2.0 fields that you want, but the app should probably still poll RSS feeds directly to look for new episodes. Any missing 2.0 metadata can be added later.

Obviously not a trivial thing to implement.

An easier solution might be if we can zap the index to hurry up and refresh our favorite shows.