The person in the tweet may(assuming charitably) be conflating "Case Fatality Rates" and "Infection Fatality Rates". Here's a helpful video by potholer54 expla

The person in the tweet may(assuming charitably) be conflating "Case Fatality Rates" and "Infection Fatality Rates". Here's a helpful video by potholer54 explaining the difference between the two - https://www.youtube.com/watch?v=eAB43K2gtOk https://www.youtube.com/watch?v=eAB43K2gtOk