Rivers said it has no b-sides and that he considers it a new album. While we have heard Turn it Up or Turnin Turnin before, we're not sure if it's the same version on the album. We also don't know if any of these tracks are versions of the songs we haven't heard, or possibly recordings of them we haven't heard.
Either way, from Weezer's perspective it counts as an official Album. In my own perspective? Yeah I see how it walks that line between the two. Either way I'm getting it haha.
Rivers himself said this was Album 9.
The Beatles did this with Let it Be, that's still an official album right?