The Awasu DevLog
feed nevers flags new content when read in Awasu. Is this is because every item points to the same URL?
Yes, it's a combination of this and the fact that you've probably got the items marked as read. Awasu receives new items, sees that it's for a URL you've already read and so decides that it's not worth bothering you with.
This will be changed post-2.3
but it's a fairly hefty change which is why it's been postponed.
If you mark one of the items as unread, they should all flip to being unread and new items will then be flagged as new.