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the underlying data is crazy fuzzy
The underlying assumptions appear to be bonkers.
Mortality rates extrapolated from infection rates extrapolated from actual deaths (assumed / guessed at being C19 related), being then used to derive infection rates.
Any model validation will have sensitivity analysis and caveats, but your sois-disant statistician viro-epedemiologist experts pueyo, campbell et al. either ignore this, or (and prepare yourself for a shock) not qualified to make the statements they make, or, at the very least, should be taken with a big pich of salt.
Disclaimer: I am not qualified in any of the above fields. I know enough to know that I don;t know much, and that deferring to people that do this for a living is likely a GoodIdea™
The main problem with the FT chart is not the chart design - it’s the very good chance that the underlying data is crazy fuzzy