A total Musk-ism. And 🐂💩
Newton's first law: a body in motion stays in motion. So, theoretically, this is true. Once rolling, assuming no resistance (road, air, wheel train, etc), you can "pull" an infinite mass.
The problem is Newton's second law: The acceleration of a body is equal to force divided by mass. So, if you want to actually go from 0 mph to some other speed, with nearly infinite mass, you better have near infinite force. That's torque from the motors then eventually applied to friction from the tires to the road. And the Cybertruck, no matter what they may claim, does not have that!
If you're a Musk-Fanboy (or girl), then you find these sort of statements just part of the cult users manual.