I know it defies your sense of believability but we should base our discussion on what has been stated and reported rather than what you believe to be true.
This is gleaned from a few sources and we don’t know what the final weight of the Cybertruck will be in the end, but during the presentation Musk stated that the CT and F150 weighed the same. The F150 tops out at 5600 lbs but can be as low as 4000 lbs. If you took the powertrain out of a CT and F150, the CT is going to weigh less because they saved weight with the exoskeleton design while at the same time increasing payload capability and lowering drag coefficient. Less weight and better aerodynamics allow them to use a smaller battery - we don’t know what size battery yet but it’s going to be smaller than whatever Rivian or Ford has to put in for the equivalent range and towing capability.
So the Cybertruck may be comparable to a superduty in capability but not in weight. It can carry a superduty payload but weigh well under 6000 lbs.
Tesla CEO Elon Musk: Cybertruck could hit Cd of .30 "with extreme effort" - Electrek
“So we didn’t cheat in either width, height, or length, and we’re able to achieve much greater capability in the same dimensions, same weight”
Tesla Cybertruck Event Transcript: Elon Musk Unveils Cybertruck - Rev