Nice theory, but it assumes you can trust the reported numbers from all countries. We know China isn’t being honest and learned that Italy reported all deaths “with” the virus as being caused by the virus.
Statistics supplied by the Chinese government (for all intents and purposes the Chinese Communist Party) remind me of the comment the writer Mary McCarthy made in reference to the notorious lefty author Lillian Hellman: “every word she writes is a lie, including “and” and “the.”
This assumes nothing except that standardization has a better chance of enhancing the accuracy of the analysis.