While I agree that the claim that world population is under 1 billion is bonkers, I also think he grossly underestimates how frequent and large the fraud is.
Take Venezuela for example, the UN and several NGO's have confirmed a diaspora caused by chavismo of well over 7 million people. This is not recognized by the venezuelan government and is not reflected in any of the stats pages you can find.
That's a 20-30% difference in the real vs reported population of the country.
And yes. They do fake the elections.