Give me a break.
Above the author says:
All flights have been calculated at speeds of 500 mph (804 kmh). 30 minutes has been added for take-off and landing.
So, he is computing the flight time, and the distance is based on one model, and compared to the distance on another model. Even if they are right, they are completely wrong.
You take your models, compute the times, and then compare and contrast them to actual flight times and routes.
Even if you think the opposition is shtupid, the doesn't give you the right to skip over all the actual data.