[pubsubhubbub] Google's pubsubhubbub hub isn't working?

[lam3r4370]

I tried to subscribe new blog but in publisher diagnostic
https://pubsubhubbub.appspot.com/topic-details?hub.url=http%3A%2F%2Frssreaderbg.net%2Freal%2F%3Ffeed%3Drss2
doesn't contain anything...