at 5min mark of the full video linked below, the presenter says those miles were done at "American gross vehicle weight limits
If they can get those numbers at full payload, that would be impressive. Current generation of trucks can max pull half of the minimum weight of a shipping container. That's a huge headache for everyone in shipping from the trucking company to the terminals to the ships.
Nobody is vague about a home run. OTOH, "there was no compromise in the number of swings the batter took" sounds an awful lot like a strike out.
That they're not saying it after years is really suspicious. Give us all the numbers.