Let's just be glad there weren't 100,000 people in those grandstands when it happened.
This tornado was sighted no more than maybe 5 miles from the Indy track last year, as nearly 100,000+ people packed the grandstands for the Indy-500 running that day! Luckily the tornado turned eastward and dissipated, sparing the track and many, many lives.
That was a horrible night. I was in Atlanta sitting at Turner field getting ready to watch the Braves/Cubs. (Cubs fan here) I knew all day the game would probably be cancelled, but the kids were SO excited, so we left South Carolina and went anyway. Turner field is about 30 miles or so north of the Speedway, and the storms were moving a little east of north. The game was suppose to start at 7:05, and at 7:01, the announcer said, "due to severe weather approaching the field, the game was cancelled". I had been watching the radar from my cellphone, and KNEW these storms meant business. We left immediately, but got stuck in the parking lot with traffic, and watched CG lightning getting closer and closer to our south. FiNALLY, we hit I-85 and booked it. Atlanta got 4.69 inches of rain from 8-10PM. So, we drove to Atlanta, paid $10 for parking, bought $60 worth of food, and wasted $160 in tickets, as we couldn't go back the next day for the rescheduled game, which the Cubs lost anyway - 8 losses in a row! One of the kids wanted to do a U-ey, and chase, the other one was petrified we were all going to die! Kinda of a memorable experience for them, even it it WASN'T because of the ballgame.
The NWS COULD have meant that the circular track/slope/etc. could have acted like a "wind tunnel" so to speak. If this was just straight line winds, they could get caught up within the track and create a small spinup, much like leaves and garbage do around buildings when it's windy outside. It really depends, did this tornado damage anything before/beyond the speedway?
Obviously a spinup shouldn't even be classified as a tornado, so either way, the report would be wrong.