It would, if electors haven't been appointed. And the US Constitution is clear on what the legislature is to do at that point - select electors. Not, re-vote. My interpretation, of course.
What I am suggesting is something that would be the only non-radical remedy (invalidating all of the votes from that county).
In a sane world, they would be deemed invalid because there is now no way to accurately assess the ballots and verify them. In a sane world, the voters would blame the elections officials that they allegedly voted for.
In the insane world we now live in, how could any “reasonable person” argue against the legislature stating 1) the vote there is invalid as determined by the courts and 2) this is the fairest way to remedy the issue. In other words, this county has one chance to get it right and make their votes count and we will help by bringing in more election officials from throughout the state.
We know this is bogus. What could Biden say? 50% of the voters in that county changed their mind? He says he won and he will say the legislature and courts stole the election. This is the only remedy I see absent my personal preference - toss them all.
The state legislators have two choices (and only two choices):
—Select electors to represent the state by the appropriate deadline for that state (perhaps as extended by the courts)
—Fail to select the electors by the appropriate deadline
In either event the US Congress (one vote per state) has the final say.