NZ provide a page that matches LH booking classes to levels of Airpoints and status points.
The link is
https://www.airnewzealand.co.nz/star-alliance-lufthansa

My interpretation is that LH C class ticketed flown on NZ metal earns Airpoints/Status points as full Business class.
And answering a question higher up the thread - was I using LH or NZ as the search option in the airpoints calculator?
Definitely NZ. It isn't possible to input YVR-AKL as an airport pair when LH is the chosen airline.
As a further point for consideration - we took NZ23 (YVR-AKL) in Business in May last year (2025) and earned 492.90 Airpoints and 456 status points. If I recall correctly, the flight was ticketed in Z class.
My original question still stands - why the difference between the reported earnings on the app vis a vis the airpoints calculator?