Nope, it is correct. Not a play on numbers! Watch the video. It's very well explained. And the maths checks out
No laws of thermodynamics are being violated, it's just that the unladen truck is so inefficient at turning fuel into motion that it's actually more efficient to charge the Tesla, with all the losses that entails, and then have the Tesla convert that energy back from electricity to motion again, than to let the truck do it. The inefficiency of the truck vastly outweighs the losses of converting the energy 3 times, because the truck is producing *way* more torque than it actually needs to propel itself along (it is designed to be able to tow things / pull heavy loads, after all!). Most of that energy would normally just be wasted as heat, but in this case the Tesla is using it to charge, effectively, and then converts more of it back to motion than the truck could have in the first place.
Its the equivalent of using the engine in the truck to drive a generator which charges a battery, then using that battery to drive an electric motor. The engine + generator + electric motor combination is more efficient overall than the engine is alone via direct drive, because the engine is vastly over-spec'd for the purpose, so even with conversion losses the net efficiency via electric is higher. The generator can extract more useful energy from the engine than can be gained just moving the truck
In fact, some hybrid electric cars / trains use this approach, exactly because it is more efficient! Engine->generator->motor often beats the engine directly driving the wheels mechanically, somewhat counter-intuitively!
