Isn't that the part of Italy where hospital collapse actually happened? And in the same article they conjecture they are now at ~herd immunity. And the demographics are skewed towards the elderly so again they themselves estimated the death rate being consistent with 1%, age-adjusted. And they counted ALL the surplus dead. This is an upper bound of the absolute worst case, as far as I can tell.

Nobody there is going to die in April from covid?

They are past the peak (again based on the info from the original article), so it doesn't seem likely the numbers will change a lot; not to the level of 6%/3%/other numbers being suggested in other sources.

A small town doesn't really count as a "part" of a country.

It's also probably just a statistical outlier. Even if the overall IFR is 0.5% you will see some areas with rates higher or lower than that from chance or their demographics.

It's still early on in the pandemic. The vast majority of the people who will die from it still haven't yet. It's way too early to be putting ceilings on the overall death rate.

I believe there are more examples, but that is one of them.