I've started using XML Standalone Sitemap Generator today. I'm most interested in its RSS Feed feature.
However, despite following the instructions as well as I can, the generated Feed is very different from what I have intended, such your example at
https://www.xml-sitemaps.com/feed_rss.xml.
It shows only a link to the main page and then an useless list of dates without title or links.
Attached is a picture showing what I mean.