For those complaining about the comparison, they did at least mention it:
>>> Comparing events that happened more than a century apart has its perils. For instance, the population of the United States in 1918 was a third of what it is now. So as a percentage of the national population, the Spanish flu deaths still has the lead on Covid-19.
>>> Comparing events that happened more than a century apart has its perils. For instance, the population of the United States in 1918 was a third of what it is now. So as a percentage of the national population, the Spanish flu deaths still has the lead on Covid-19.