Google's Search console says it can't find the page https://portmap.dtinit.org/articles_feed. I wondered if there was still a link to it in our code from before we changed that URL to /rss.
This line in views.py:
link = "https://portmap.dtinit.org/articles_feed"
means that our RSS feed still references this link in line 4:
<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
<channel>
<title>RSS Feed</title>
<link>https://portmap.dtinit.org/articles_feed</link>
<description>Articles from Portability Articles repo</description>
So I guess this should have changed when we changed the URL to /rss