I was wondering about that. The way that he described it in the post was that it was due to the resolution of the MAF itself and not just that they're using the same number of cells in the tuning as they would with a stock build. I agree that the number of cells in your choice of tuning would come into play since you're programming for a wider range of variables (varying levels of boost, significant difference in injector size, upgraded MAF, fuel system, etc) using the same Base Fuel Schedule by RPM tables for tuning.

I know just enough to be dangerous inside Osiris Tuner on my NA setup, and can only imagine that the complexities of tuning something like this is an artform more than a science.