https://www.scientificamerican.com/article/debunking-the-false-claim-that-covid-death-counts-are-inflated/

A persistent falsehood has been circulating on social media: the number of COVID deaths is much lower than the official statistic of more than 218,000, and therefore the danger of the disease has been overblown. In August President Trump retweeted a post claiming that only 6 percent of these reported deaths were actually from COVID-19. (The tweet originated from a follower of the debunked conspiracy fantasy QAnon.) Twitter removed the post for containing false information, but fabrications such as these continue to spread. U.S. Representative Roger Marshall of Kansas complained in September that Facebook had removed a post in which he claimed that 94 percent of COVID-19 deaths reported by the Centers for Disease Control and Prevention “were the result of 2-3 additional serious illnesses and were of advanced age.”

Now some facts: Researchers know beyond a doubt that the number of COVID-19 deaths in the U.S. have surpassed 200,000. These numbers are supported by three lines of evidence, including death certificates. The inaccurate idea that only 6 percent of the deaths were really caused by the coronavirus is “a gross misinterpretation” of how death certificates work, says Robert Anderson, lead mortality statistician at the CDC’s National Center for Health Statistics.