At the end of the day, someone needs to take action with the blessing of their state to execute the disqualification. You say a "GA election official" could just unilaterally disqualify him -- but that isn't true. A GA election official would need to go through proper channels in their own state to remove someone from the election, or else face immediate removal and replacement. They would need to go through the Sec State office channels. No one can individually snap their fingers and make it happen logistically. If that were possible, some MAGA type would've done it in 2020 or 2022 just to sow confusion. Lord knows they try to steal elections through every other immoral method available to them.
In short: 14th amendment disqualification is (properly) extremely rare and has no process. Congress or the many states would need to pass laws to outline a process to create a mechanism of enforcement for your vision of an individual election official throwing the switch to work. Otherwise you are relying on lawsuits or malfeasance so heinous that it defies politics to make it happen (and there is clearly no amount of malfeasance from Trump that the current GOP couldn't stomach).
The state will need to take action. All three branches of the state government would need to work together to make it happen. Any one of them could pooh it away. And THEN you would also go on to have a federal lawsuit, where again, the SCOTUS would certainly enjoin the move pending a case, and in that case anyone who knows anything about the court could predict the outcome would be a deferral to Congress to clarify the amendment. Assuming they don't just outright ignore parts of the amendment as they have many times done elsewhere for politically inconvenient or unclear language.
Maybe this would happen somewhere progressive enough. Maybe Massachusetts will disqualify him, but that won't impact the election results. (PS: if National Popular Vote were a thing, this would be WAY more compelling). But MA refusing to cast electoral votes for Trump is not going to affect any election.
Which is why I described the point as moot. It's not wrong. What you are saying is almost certainly technically correct, on the whole. It just doesn't matter. Whether you are right or wrong will not impact any outcomes.