The CEO then told him that some of the floors could not handle more than 500 pounds of pressure, so rolling a 2,000-pound server would cause damage. Musk replied that the servers had four wheels, so the pressure at any one point was only 500 pounds. “The dude is not very good at math,” Musk told the musketeers.
Musk not very good at understanding that even if his arithmetic was accurate (article states earlier that the weight was higher), that's only true if the racks are perfectly balanced and not moving.
And only if each of the wheel was on a different section of floor? A bit of floor having a total pressure limit of 500 pounds presumably doesn't cover that section for multiple pressure points of 500 pounds
Musk not very good at understanding that even if his arithmetic was accurate (article states earlier that the weight was higher), that's only true if the racks are perfectly balanced and not moving.