What's interesting about this is that it doesn't look like it accounts for the expected reduction in deaths due to lockdown -- a lot of people die in car accidents every year, and at least early on in the pandemic, miles traveled was reduced by nearly 90%, and car accidents went way down, and even further down when you consider it was impossible to drive home drunk from a bar.
Which means the excess deaths would be even higher than shown here, at least early on.
EDIT: Looks like I am wrong. Below someone links to a report showing that traffic fatalities actually went up because the people still on the road were more risky. I was basing my statement on estimates made in early 2020.