It is clear to me why they put “noidex” so that page does not appear in the results, but only the URLs listed in it,
but for this reason google throws an error during my testing.
how much influence it has or not - I don’t know.
I see that you recently edited robots.txt
Also try to understand that GSC can often keep the result in the cache
and it takes some time for the error to disappear
Besides that, know that the sitemap is not that important, because once g.bot comes to your website, they will index it whether you have sitemaps or not.
and for that it is enough to add the website to GSC.