Yes, indeed, what we call ‘confidence interval’ in our report is better described by the term ‘credible interval’.
We chose to use with the term ‘confidence interval’ because my impression is that this is the more commonly used and understood terminology within EA specifically, but also global health in general—even though it is not technically entirely accurate.
I agree this is most likely a lower bound—we tried to emphasize this in the report.
I was not aware of the theory that fungal infections are the primary cause of cancer—many thanks for sharing!