But cases clearly weren't doubling every nine days before that study. That is demonstrably incorrect. Positive cases as reported on the Government's website had slowed down markedly and new infections had started dropping per the weekly ONS pilot study and the ZOE covid symptom study. Indeed the creator of the ZOE study believe infections peaked before lockdwown.
https://www.spectator.co.uk/article/...efore-lockdown
If cases were doubling every nine days why isn't this now being reflected in the death figures?