I was assigned to the Jacksonville Flight Test group of the A&R section in June of 1946. At that time Butch Voris was trying to find men that could fly close formation without flying up each others ass. There were no official flight demos at that time. The SNJ did not appear until long after they had transitioned to F8-F Bearcats. This transition happened in August of 1946. Even then we had to clamp 125 pounds of lead around the tail hook. Lt. Robby Robinson dove a Bearcat into the runway during the intial demo before the public which happened on Navy Day in September of 1946. I don't know who the writer used as a source for his information but it's apparent he's dealing with misinformation. But having had to clean oil off the belly of F8s in the blazing heat and humidty of Jacksonville, Florida, I know what I'm talking about.
Like I've said before many times before, you can't believe everything you read.