No the whole hot temperatures create higher simulated altitude conditions in both air density in general and in the density of air including the available number of of 02 molecules per cubic meter is spot on as well as his pilot phraseology; it admittedly sounds weird to non-pilots. We call it high altitude density on hot days and it effects calculations of maximum take off weights for aircraft as well as runway required take off and landing distances. I was a scientist before becoming an airline pilot. If this is something you want to track without making the calculations to figure it out get yourself a paid subscription the the aviation app Foreflight.