Truck was on a different frequency from the aircraft so they couldn’t even hear each others’ clearances.

Also first time ATC told the truck to stop it wasn’t too clear who the message was addressed to. It’s a bit hard to hear “Truck1” there, not clear who he wants to stop. The second time, one can argue by the time “stop” command was heard it might have been better to gun the engine. As the truck sort of slowed down in the middle of the runway.