It’s interesting that instead of being curious enough to give Vineeto the benefit of the doubt and wonder what she means by this, you assume she’s so ill-informed that a 2-second Google search is enough to dismantle her position. I’m not sure whether this is an ironic example of hubris in action .
This is demonstrably false, though. Just start a fire in a fireplace. The air (99% of which is nitrogen & oxygen) warms as a result of contact with the fire. All of it warms, not just 1% of it.
Alternately turn on a heater that heats the air near the floor. The hot air will rise to the top. Then stand up and wave your hands in the air. You’ll feel the heat. The air as a whole (99% of which is nitrogen & oxygen) warms up. It is absorbing the heat from the air below. All the air is hotter, not just 1% of it.