If you take the percentages from the CDC and multiply them out (and don't fall for the "polio" vs "paralytic polio" sleight of hand), it was way smaller than that - somewhere on the order of 0.01%.
The flu, for example, was always a worse risk than polio, people just became fearful of polio because we found a way to save some lives in a non-ideal way, which became very visible.
Presented as fact without evidence, preemptively dismissing contrary evidence from the most likely source to have the historical data. I'd love to see your sources for the risk of severe lifelong injury or death of polio vs the flu.
The flu, for example, was always a worse risk than polio, people just became fearful of polio because we found a way to save some lives in a non-ideal way, which became very visible.