I didn't say I knew exactly how they suppressed the virus, but I did say that we /do/ know that they have suppressed the virus.

People want to raise doubts about the effectiveness of their suppression by implying that they have not achieved suppression but rather their younger population means they are not suffering deaths as a result. This we can say with a lot of confidence is not the case because their demographic advantages are not that great and other nations with similar demographics have not been as successful.

We do in fact need to understand their success, that is why it is so important to avoid dismissing their success with demographic excuses!