I bought a new TV last year after my Hisense kicked the bucket and had a similar experience.
Not sure if it applies to your situation, but I just factory reset my TV, never enabled wifi, and hooked up a smart device I had lying around (Nvidia Shield). Now it all works great and if the smart functions upset me I can throw just the smart TV part in the trash and go back to my VCR.
Oh they will, I use a website that yanks the feeds. Having them all in one list like that makes it easier for me to parse through them though.
If you ever need to yank the RSS from a show then I have lots of success with: https://www.labnol.org/podcast. It's specifically for just this kind of thing. Weirdly a lot of shows, even on their own websites, don't make RSS feeds readily available.