A lot of the numbers he's using comes from MMA Weekly
who report the numbers after the NSAC or CSAC publicize the gate reports. You can probably find the numbers from the NSAC or CSAC sites directly (it will just take more searching). I know quite a few of the reported "sell out" records from the past UFC events didn't take into account the space taken up by the Cage or the amount of Comp'd (free) tickets made available to the public. That's probably what he's refering to.
It doesn't matter if you agree or disagree
... As long as I don't bore you and I spark a moment of thought, my goal is achieved
Queng leon queng tigre ecu tacacut, queca pa? - Pampangan Mandarigma Motto