This guy is doing a post-doc at Brown University.
He has a long thread on excess death estimates which support his conclusions.
Is this crazy?
The US CDC has put excess deaths from all causes in the US in 2020 at ~561k (bottom of the range, too). That's 0.17% of total US population of 331 million.
Global population is 7.8 billion, X 0.17% = 13.26 million.
But 13 million is probably an underestimate, probably by a lot.
If the rest of the world had health care available as in the US, 10-15 million excess deaths would actually be in the ballpark. The thing is that assumption obviously isn't warranted.
Population data gathering over the coming years is going to show huge deficits which researchers will realize cannot be explained but by pandemic deaths. India, for example, and to its credit, is underreporting COVID deaths because it insists on having actual COVID diagnosis. The funeral pyres for cremation in India are working round the clock, but those numbers don't jibe with officially reported COVID deaths in many jurisdictions, by large margins.
When the history of this thing gets written in ten years, the numbers are going to stagger.