That was a good retrospective. I've watched so many of Niko's talks I could hear his voice in my head while I was reading.

Was the "Libz Blitz" a part of the "Impl Period" work, or was that a separate thing? (I noticed it wasn't mentioned here.)

AFAIK, the Libz Blitz was a totally separate program as part of the overall execution for the 2017 plan, much like the `impl period` itself.

That's correct. The Libz Blitz was basically the name for the library team's plans for 2017 overall. The impl period covered the whole project.