I don’t think there’s sufficient evidence here to suggest that it isn’t working.
One of the team could check in your specific case as to whether email was sent to your account, as it stands though you’re the only person reporting a problem.
I am watching the release-notes tag (not just the first post) for quite some time. And the 2.8.5 Security Release was the first and only one I got notified about.
It does not seem like an email issue to me, because my notifications here on the site also only show the 2.8.5 release post.