According to hit.com:
As per NY Daily News, the ‘dead loop’ or the Korbut flip was banned because there was a high level of risk involved.
The dead loop was performed by standing on a high bar, executing a backflip, and grasping the bar once more. Olga, who represented the Soviet Union at the 1972 Olympics in Munich, was the first and the last one to perform that stunt.
Olga’s performance earned her 9.8 out of 10. Later, as per the Code of Points, standing on the high bar was banned due to the risk involved. Thus, it was the end of the Korbut flip.
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