I'm aware of the 210 incident, and that engine was very badly damaged. It did fly for a short time after refuelling. I expect he changed fuel tanks during that time.
I know of another misfuelling incident (with avtur instead of avgas). In this case the aircraft took off shortly after being refuelled and the engine failed shortly after liftoff and they landed on a road.
I expet any avtur in the tank that is supplying the engine would result in immediate failure. If it (the PA31P) was misfuelled there will be records of that.
Regarding the engine surging. This could be caused by interruption of the fuel supply to the engine. When that happens the prop goes to full fine, and unless the throttle is retarded the engine will go to max RPM when the supply is restored, and then reduce to what it was as the prop pitch changes. (don't ask me how i know)