This would actually be great; I'm reasonably sure I can read faster than a podcaster can speak, and I can certainly skim faster than I can listen for key phrases with a podcast on 2x speed.
That is certainly more labour intensive. I transcribed a couple of lectures from youtube (ok they were mathematical) and it is quite time consuming and I made a lot of mistakes too.
If the recordings are high quality and enjoyable to listen to I'd subscribe to that podcast. Most web content does not have an audio transcription beyond screen readers.