Are you aware of an existing API for this kind of thing?
It’s great if multiple platforms and multiple plugin developers can leverage the same API as apposed to, for example, an AntennaPod-specific API.
That said, I just looked at the interesting tool you linked to and it doesn’t appear to me to be a plugin. I’m not a developer so I claim no expertise in such things, but if I read that page correctly it seems that the ad block tool actually processes the source podcasts in question and creates a new RSS feed that you would subscribe to.