If he's winning the popular vote by 9 points, he's won WI, MI, PA, OH, FL and many more. In that scenario, you have states like Texas being a toss up.
Hillary won the popular vote by 2 points in 2016. If Joe wins it by 4-5 points, then yes, that scenario may happen. But that'd be a huge historically anomally.
If you're winning 50% plus 1, you are definitely getting 270 electoral votes.
Trump got a crisis boost but it wasn't even as big as most foreign leaders or even governors in the US
This is a referendum on Trump. And Trump is a terrible president. He can obviously still win as GOP state legislatures may move aggressively to suppress the vote such as Wisconsin's which is brazen as fukk.