Here are some threads and Community Guides written by Search Product Experts trying to explain the confusing wording in the Google Search Console (GSC) and emails received from GSC
This one is a fun one, where we're kinda saying the console doesnt actually mean what it appears say it means
https://support.google.com/webmasters/thread/184533703/are-you-seeing-couldn-t-fetch-reported-for-your-sitemap
Primarily Blogger but interesting
https://support.google.com/webmasters/community-guide/254759331
Do I need to fix all "pages that aren't indexed" ?
https://support.google.com/webmasters/thread/202184638