That's not really what is happening there at all. It's bad reporting. Also, it's not just Bucks County (which, by the way, voted red so they aren't trying to swing the race in favor of Dems).
The state Supreme Court has made a mess of the voting law in PA. A good friend of mine has clerked on that court for a while, and while I can't spill any details, the basic problem is the tension between the legislatures' restrictive voting statutes and the state's constitution, which is very much pro-democracy. And that came to a head earlier this year in the Supreme Court's ruling about undated ballots. That's the "ruling" supposedly being denied.
But in reality, that ruling was not a ruling at all. It was dismissed on procedural grounds -- basically the plaintiffs sued in the wrong court (PA has a complex court system) and thus the Supreme Court didn't have jurisdiction. The underlying question of whether the ballot-dating requirement is constitutional remains unanswered. Three of the Justices on the Supreme Court wanted to address the question by using something called "King's bench jurisdiction" but there wasn't a majority for that.
So in absence of King's Bench jurisdiction, there are only two ways for the issue to be presented to the Court. First, the county boards can refuse to count the ballots . . . and then in a very close race, one of the candidates will sue and we will get a Florida 2000 situation where the PA Supreme Court could be put in a position to decide the national election. The other way is for county boards to count the ballots, as they are doing, to put the issue in front of the state Supreme Court in a less charged setting. Indeed, those actions are being challenged (I think by the secretary of state) so we will get a decision on this. And having a decision, either way, is better for PA than no decision at all.
That's what this is about. It's not about trying to steal an election. I base my conclusion on 1) having read the relevant opinions; and 2) from my friend who is like an assistant coach, sort of.