I can't speak to Georgia election law, but I live in Pennsylvania and the Democratic Party doesn't have any authority to kick anyone off an election ballot.
Since judges are not in the habit of doing things just because they were asked to by a lawyer, especially Republican Pennsylvania judges at the behest of lawyers for the Democratic party, I went and looked up the case.
They used ineligible electors to get on the ballot.
I don't see how it's the Democrats fault they weren't up to the task of following Pennsylvania election law.
To be more specific, in the state of Georgia the requirement was 7500 signatures to get on the ballot. After volunteers got 17,000 signatures, the democrats sued saying that it was actually 7500 per elector not per candidate, so we would need a total of 120,000 signatures (7500 for 16 electors) and a republican appointed judge ruled in their favor. I believe we are still on the ballot as by the time that ruling had came down the ballots had been made at least for early voters but no votes cast for Claudia de la Cruz will be counted.