I have seen a few posts wondering how they can convert YouTube videos to audio only or Podcast like files.
I use a product called 4k Video Downloader https://www.4kdownload.com/
There is a 4K YouTube to MP3 as well, I have them both downloaded. I can choose to download either.
It looks like there are even options to do this online. I have not tried this I downloaded the software. It is free. However I have used it SO much that I actually bought a license. It was cheap and I don’t mind supporting them.
I hope this helps.