The VP certifies the results received by the deadline. That wouldn’t change anything here, and she would be obligated to declare Trump the winner. Like Pence, the VP can’t decide not to certify legitimate results submitted to congress by the deadline. The point here is that select blue states won’t make the deadline through republican stalling, SCOTUS won’t “interfere” in the election by adjudication, so the VP is required to only consider the full electors submitted by the deadline. And it would be perfectly valid at the federal level. The state actors might be committing a crime by stalling, but Trump will pardon them, so they really have little risk.