If we linearly extrapolate the December 18 data to December 31st, we get 91773 * (366/353) = 95,152.

Which would indeed be the highest level this decade, but still only 3.2% higher than 2018.

Sweden's 2019 deaths were also the lowest in the decade, so there was a lot of built up 'dry tinder'. In fact the excess deaths in 2020 match up almost exactly with the 'non-deaths' of 2019.

This concept is also matched by research:

https://www.news-medical.net/news/20201116/Study-compares-de...

"In Sweden, the observed increase in all-cause mortality during Covid-19 was partly due to a lower than expected mortality preceding the epidemic and the observed excess mortality, was followed by a lower than expected mortality after the first Covid-19 wave. This may suggest mortality displacement."