They have subtracted out the average number of deaths on each day from 2015-2019 so that it is flat. If you roll over the orange/red rectangles for each country

They have subtracted out the average number of deaths on each day from 2015-2019 so that it is flat. If you roll over the orange/red rectangles for each country you can see expected deaths, excess deaths, and % of excess deaths. Long term the US is seeing about 10% excess deaths (mostly in the 40% of unvaccinated) since COVID was introduced. That is why you can also see a negative number of excess deaths lower down the page.