RSS feed broken

Your link points to Feedburner.com, a service that provides feeds. There is a JavaScript at the beginning of the feed which does not belong there. As the output does not come from your WordPress, you would need to contact Feedburner.com to resolve this. If you use a plugin for their connection, you can certainly contact their support.

HOW? Apparently the Feedburner page doesn’t exist. I get a 404 error.

Error 404 (Not Found)!!1 (feedburner.com)

You can find Feedburner’s support at https://groups.google.com/g/feedburner

Well, no one has responded to my post at Feedburner.

Unfortunately that makes sense.

Feedburner was dramatically scaled back and almost discontinued in 2021.

Have you considered just not using it?

No. I don’t know how. And can’t I just EDIT a single line which is corrupted somehow?

https://feeds.feedburner.com/gamingpodcast

No, because Feedburner’s feeds are entirely controlled by Feedburner.

What’s the URL of your site?