The 2009 NASCAR Banking 500 only from Bank of America was a NASCAR Sprint Cup Series stock car race held on October 17, 2009 at Lowe's Motor Speedway in Concord, North Carolina. The race was the thirty-first of the 2009 NASCAR Sprint Cup season, the fifth of the Chase for the Sprint Cup, and the only race scheduled at night during the ten-race Chase for the Sprint Cup that ended the season.
2009 NASCAR Sprint Cup season ended in October.
There were only 5 races left so the season could have ended in October, but we don't know from the context how close together the races were held, so the season could have ended in November, or even later. The AI likely attached onto the "held on October 17" and assumed the whole event started and ended on October 17, whereas that was actually only one race of the season.