Two things. One, statistics do not always determine “records”. If a person has encountered millions of people in their life and murders one to wear their skin a la Silence of the Lambs, are they an excellent and safe citizen?
We can’t have coasters operating where “only two people die on this a year” That’s absurd, obviously. For some things, the safety rate has to be 100%, barring circumstances like a rider having a heart attack. We see this anytime there is a product recall for a single injury or death.
Second, how can you confidently say that the rider’s death was caused by a spinal condition? His anatomy may have been a bit atypical, but it’s not like he had superhuman elasticity or something. At most he may have had poor muscle tone and increased flexibility, something potentially present in many people. Atypical, yes, but uncommon in a country of over 300 million, no.