Low velocities
The article says "Aerodynamic heating is not a factor at subsonic speeds", but it is present isn't it? As T_amb*(gamma-1)/2 * M^2 is continous, then heating is taking place at all speeds, and whether it is significant depends on what is being considered. For example, Mach 0.5 in air at 20 deg C gives a temperature rise of close to 15 deg C.