I heard him say this and could hardly believe my ears.
As reported by the Guardian:
Trump’s press conference has ended after a series of falsehoods and misleading claims. At one point he compared the Covid-19 crisis to the “the great pandemic” of 1917, saying it was a “terrible thing” that “probably ended the Second World War, all the soldiers were sick”.
The pandemic occurred in 1918, and World War II ended in 1945.