Considering how much he lied about everything, pushed snake oil cures, and basically failed to take decisive action when the virus came, anything the Orange One says should be taken with a heaping load of scepticism. To be honest, anything a politician says should have some level of scepticism, but if Biden said it, I'd be much more ready to believe it. Heck, if Bush said it, I'd believe it more.
Remember the story of the boy who cried wolf? He lied all the time about it, and when it finally happened, nobody helped because they thought he was lying again. Same thing with Trump and his cronies. They started by lying about the size of his inauguration crowd, and never stopped. So, when serious shit happened, how can anyone with a brain believe his BS?