While the other stuff is readily available, there is not a formula to convert a real world result to standard conditions using that data, since fuels do not respond linearly. Hence the need for a lab test engine.

What BMW could likely conclude from the data is that whatever the published AKI was of the fuel being used, a combination of altitude, temperature, engine condition, etc, was causing more retardation of the ignition timing than they would expect. That could help in the diagnosis of a complaint of reduced power or mileage, not a warranty situation though, unless the fuel was really bad (ie kerosene)

Interesting link on the dielectric analysis. Looks similar to what BMW is doing with onboard monitoring of oil additive levels.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue