The following URL can be opened in various other RSS readers as well as Firefox/Palemoon as an RSS feed. The code is from a popular template and I've used it for a while now.
QuiteRSS tells me it "can't find the feed URL" when I try to add it as a feed.
Please have a look at this issue
Unfortunately, I do not know how to solve this issue.
Can you tell what the problem is but not fix it code-wise or is it simply not clear what the problem even is?