Yes, his graph is correct because it shows that as the average kinetic energy increases, so does the temperature. This is called a direct relationship.
The atoms and molecules that make up a gas are constantly moving. Temperature is a measure of the speed with which they move (more accurately it is a measure of their kinetic energy). The higher the temperature, the faster they move. It is thus produced a greater intensity in the collisions against the walls: the pressure of the container containing the gas increases.In this way, if the graph shows the increase in temperature as well as the increase in speed, yes, it is correct.
