Yes but that is like any medicine, don't eat a packet of Panadol in one sitting, but you can still buy it. Believe me the people of Hunza eat far in excess of what we are told is dangerous. I know people who have eaten 20 a day for 30 years, no problem. I think someone reacted badly to it so, as people do any measure of medicines, so they banned it. And the side effects are only dizziness and vomiting even if you overdose or are allergic, fairly benign compared to tobacco, which even though it is carcinogenic is still available. I can no longer eat kernels however.Questioning is what science is about - it's the purpose of the whole enterprise.
With that being said, I'd be very careful about the logic you are using here.
As with any substance, what is important to note is the dosage you are taking. Every substance is potentially toxic. So while the amount of amygdalin you (or the people in Hunza) have taken may be below the limit that results in a harmful level of cyanide being catalysed, it doesn't follow that a) cyanide isn't present in apricot kernels (or apple seeds for that matter) and b) it is therefore safe to eat them. My great grandfather smoked like a chimney and didn't get lung cancer - it doesn't mean tobacco isn't carcinogenic.
More research would need to be done to understand if this is a real phenomenon (a lot of centenarians turn out not to be as old as they purport and it makes it doubly difficult in the absence of things like birth certificates - https://www.vox.com/2019/8/8/20758813/secrets-ultra-elderly-supercentenarians-fraud-error). I've also read accounts that it is a myth that the Hunza have long life expectancy and that the claim stems from statements made by the local king. John Clark's book - Hunza - Lost Kingdom of the Himalayas contradicts the claim of longevity. He was a medical doctor who lived amongst the Burusho people and he noted that many of his patients were unhealthy and had many of the same ailments that other poor Pakistanis were suffering from.