Blaming Trump for covid itself is stupid and contradicts a lot of what he actually did that other people were complaining about. EG. wanting to close flights and being called "xenophobic" by democrats and newspapers.
You can definitely critique his handling of it though, and the same goes for Boris Johnson in the UK. He had by far the worst most incompitant repsonse out of anybody. The virus was going to get here regardless though, it was just a matter of time. Blaming is useless at this point.