Was it? I don't follow pole vaulting. How long had the prior record stood? By how far did he break it?
When Beamon made his historic jump in Mexico City there was absolutely no precedent for what he did. He completely destroyed the existing record, and jumped farther than was thought to be humanly possible. He broke the existing record by almost two feet (21 3/4 inches, to be exact). The record had been broken many times before, by an average of 2 1/2 inches. The biggest Improvement in history was 6 inches longer than rhe prior record. PhD dissertations were written about that single jump. Physicists and physiologists marveled over it for many, many years.
The record he set lasted for 23 years, while all other track and field records were shattered over and over again. It is, almost unbelievably, still the Olympic record, and still stands as the second longest jump of all time. The Beamon jump in Mexico City is the stuff of legend.
Since I don't really know much about pole vaulting, maybe you can explain how this could come anywhere near what Bob Beamon did.