The "assumptions" you mention were based on industry standard or prices prevailing at the time of calculation.
Don't want to be a pain the ***s but volatility of bitcoin still was 300% throughout the last year. I fail to understand how one can rely on such a volatile instrument to base calculations on.
every business has its own secrets that give his owners a competitive advantage.
You can indeed postulate that Gain may have some mystery super mining equipment that gives them an edge over the competiton, despite there being no evidence or even claim of such.
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Neither evidence is an the other side. Calculations based on assumptions, that may or may not be close to reality. We don't know which resources are used to pay that kind of payouts, we can only assume.
All of that IMHO