You didn't read the full post, or you don't know the 744...
The 159T of block fuel is the most that airplane can take in HKG. While you might ASSume the max fuel available is 161 or so, that is only at standard density, NOT in the hot tropical summer...
Also, there is MINIMUM landing fuel to consider, which varies with destination, weather, alternate, reserve requirements, and a bunch of other factors. You cannot load more freight, just to run out of fuel!
The customer obviously chose to trade range for payload. You should understand that concept...
I will repeat: I do not rely on book figures or "could have" figures, but REAL figures!