It is hard to say whether this is true. There are two reasons why there could be excess mortality caused only indirectly by covid-19 (so not part of covid-19 mortality):
1) Overwhelmed hospitals cannot offer proper healthcare to some patients with non-covid-19 illnesses. This might happen in Italy or Spain.
2) People are too frightened by covid-19 to visit doctor even in acute cases of other illnesses (e.g. minor stroke) and sometimes visit them too late. This was reported by doctors in Czechia.
https://www.independent.co.uk/news/health/coronavirus-care-h...
UK coronavirus deaths more than double official figure, according to FT study:
https://www.ft.com/content/67e6a4ee-3d05-43bc-ba03-e239799fa...
Yes.
Sure, I agree that it's very uncertain.
However, if that's the case, then that just furthers my point, because it means that Sweden is overreporting covid-19 cases, and is actually doing even better than official stats say they are.
Huh?
If a country is in lockdown, and still experiences excess mortality, but the official covid-19 deaths aren't enough to cover that excess, then.... what the hell did people die of?
The expectation is that because of lockdown, the excess mortality from non-covid-19 causes should be lower than previous years, and therefore all the actual excess, and probably more, is attributable to covid-19. Which means that countries where the official covid-19 number is lower than excess mortality, like the UK, are underreporting, while countries where the excess mortality matches the official covid-19 number, like Sweden, are not underreporting.