How do you mean? I am trying to understand what you're saying, it seems you mean that people on HN only _think_ they understand how battery technology works saying this is impossible, but in reality they have no idea, and it's trivial to make an explosive device like out of pager batteries?
Simple logic and science. Batteries do not cause forceful explosions like we've seen today. These pagers were intercepted and implanted with explosives (or entire load swapped with pre-made malicious ones) and then allowed to continue on to their destination. Thus I can say with 100% confidence that this was a supply chain attack.
What did you base that on though, 100% is pretty confident