It doesn't need much of one with aluminum, just milimeters away from the pressure plate. I it overheated in a significant way, it would have gotten that bell housing hotter than 105 degrees. Mine has never given a symptom of excessive heat. It had another opportunity today and it showed nothing of concern....just an observation here: The heat generated by the friction material does not have an easy conduction path to the bell housing since they are not directly connected. So any temperature increase due to the hot pressure plate would either be by convected air inside the bell or by radiation, certainly not as efficient as direct conduction.
Mine passed the clutch wear test at 35k. It now has 41k. It has towed, done long days of off-roading, and been driven hard many, many times. I'm convinced mine has no issue. The external temp is just another piece of evidence. Not conclusive in and of itself, but I think it is a pretty good sign that it didn't show a higher temp than 105, immediately after being punished like it was.