You just don't get it. The nominated executor need do NOTHING to not be the executor.
Bob writes a will nominating Bill as the executor. Bob dies. Bill sits at home and binges every episode of Days of Our Lives and never responds to calls, letters, or any other method used to contact him. He won't be the executor.
Bill doesn't have to contact the court that he doesn't want to be the executor.
Have you ever registered a will with a probate court? Have you ever been named executor in a will? Have you ever been named a beneficiary in a will?
According to your example, Bob thought enough of Bill to name him executor. I'm sure Bob asked Bill if he would do it before naming him. Now Bob dies and Bill just does nothing and Bob's will never gets probated if Bill is in possession of the will which is very likely. Or Bob's family finds the will and brings it to the probate court. Bill as the named executor will be contacted by the court because he is the named executor. Now Bill can be a prick and continue watching Days of Our Lives or he can abdicate and name a family member or someone else in his stead.
Your answer is not incorrect, but it is not complete and is therefor misleading. You present this as the ONLY way to do it, but it's not the only way to do it. Your statements imply that the nominated representative MUST take some action in order to decline the position, which is wrong.
One would think that when someone names someone as executor that the testator knows and trusts that person to do something when the testator dies. While I agree that the named person can do nothing the right thing to do is to submit the will and abdicate.
You made yourself perfectly clear. If the person you nominated to be the executor decides he doesn't want to do it, then he doesn't have to do it. You should name an additional person (or additional persons) as successor/alternate representatives in case the first one doesn't want to serve in that capacity.
I agree with you here that the testator should name an alternative if the named executor doesn't want or is incapable of serving. And the way the named executor says no is by (in PA) is to fill out the RENUNCIATION form and submit it to the probate court.