Yeah, you really got projects mixed up. It was Replicant, the attempt at creating a libre Android distro, that got stalled. Stalled due to being unable to work around the nonfree device firmware and binary blobs found in today's smartphone models.

In contrast, Librephone has only been aannounced this week, and it attempts to reverse engineer stuff related to device firmware and binary blobs. It's not the same as creating another Android distro, and any usable results won't be tied to Android, so they for example can be used to give better support for mobile non-Android Linux efforts.