He's probably heard something somewhere and made a stupid assumption. Road wear is heavily influenced by the pressure between the tire and the road. (ie: the weight per square inch. Or pounds per square inch). And little to do with the pressure _inside_ the tire. (It has _some_ effect, higher tire pressures generally reduce the tire's footprint on the road, increasing the contact PSI.)
Pressure inside the tire and pressure between tire and the road are very close to equal. A 120psi bicycle tire really is putting 120psi on the contact patch. And this has a small practical effect: in very soft asphalt you can sometimes see ruts caused by bicycles.
But road damage isn't entirely dictated by tire pressure