Mactechnews RSS not updated, why?

I have used many years at newsblur but since a change (on which site?) the RSS feed still showing old entries from June 2022

I already deleted the site and re-installed it - no change.
What is wrong?

Thank you!

Maybe relevant, maybe a red herring:

When I try viewing that Rss/News.x link directly , I get an error 403 forbidden.

When I go to the website and follow a link to Rss/News.x from there, I can view the site OK. ?Maybe? it’s checking for a referrer or something?

Maybe it’d be interesting to view the Site Settings in NewsBlur; maybe there are a lot of 403 errors?