Hello @distillerpod,
I am providing an answer for the detail that you stated that you wanted blog posts without podcast episodes in them. If you do not want content to appear as “Posts” then the best solution is to put them else where, aka a separate post type rather than in “Posts”. It is the most ideal solution to this problem, but you can come up with many other ways to solve the problem they just require some other plugin or logic on the back-end to achieve what you want.
You can use category podcasting, but WordPress categories are tied to blog posts and only are meant to be filtering options for posts, they are not meant to segregate posts from appearing in various parts of your website. There may be a plugin that does that but by default in WordPress, blog posts that are in categories still appear in the main blog pages and feed. PowerPress extends the default behavior in WordPress, it doesn’t change the behavior how categories work in WordPress except with giving you options for the podcast feeds themselves, which leads into your last reply.
As for changing your podcast feed, these are specific instructions: https://create.blubrry.com/manual/syndicating-your-podcast-rss-feeds/changing-your-podcast-rss-feed-address-url/ you need a 301 redirect as well as set the iTunes :new-feed-url to the new URL you want Apple to use from that point forward.
Podcast only feeds have only podcast episodes within them, no blog posts. IF you only create podcast episodes on your website, this is irrelevant. If you blog as well as podcast, then all posts (if they have podcast episodes or not) will appear as they should in your main blog’s feed, but your podcast only feed will only have those episodes, no blog posts.
I think you are expecting the opposite behavior of what happens by default. The thing to remember is that podcasting is an extension to blogging, your simply associating media to a blog post. That is why podcasting stacks on top of blogging rather than in the opposite. The most important thing to keep in mind is that podcast directories for the most part do not care about blog posts, submitting the podcast only feed is ideal that way you can maximize the content in the feed. On the opposite token, blog feeds, which are not so meaningful today as they once were, can have a mixture of blog posts and blog posts with media, if the blog reader cannot render the player then its simply viewed as a blog post, no harm no foul.
Thanks,
Angelo