Cannot import Atom Feed via URL

[theAkito]

Was trying to import this feed. It seemed to import fine and it shows up in the list of Feeds.

However, it does not show any entry, as if this Feed never dispatched any entries. I pressed Check for Updates several times, but still no entries are showing up.

To be sure, the feed was not faulty itself, I successfully imported it into another feed reader from F-Droid via URL and it worked fine, instantly.