Here's the article I read about 5 years ago. I believe this was written for street bikes but the mechanics are the same for automobile engines.
Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power
I have no idea about real world testing but this is the way I broke in the 46G3 stroker I built and it had perfect compression and held plenty of boost.
I cannot imagine that Nissan hasn't already "broken in" these engines from the factory. How else would they do QC checks?