It is not max fuel to the injector all the time. It seems like inside the tune a max fuel pressure target is set with timing and boost targets in mind and the ecu figures it out. This is kind of mentioned in the video and the ecu did not need any coding according to the video either, swapped it and it started right up with no dct or trouble codes and ran smoothly, seems like he modified the flange so it bolts in correctly, reused the bucket that rides on the stock fp spring and tweaked the fuel lines, plugged it in and boom it works. Then it seems like the available envelope to work in with fueling is just alot bigger vs the n55 pump .
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