In his book الناسخ والمنسوخ بين الإثبات والنفي, page 8, Al-Jabri quotes a rule set by the scholars, but he did not name who said it. It is
النسخ لايكون إلا بتوقيف من الشارع (Abrogation cannot be except by a direct statement from the law-giver). He starts his book with this to show that abrogation in the Quran did not happen, since no such statement was ever made. He concurs that deciding that a ruling of God has ended is not something that a human mind can possibly determine (لامجال فيه للعقل). My sentiment exactly.
Then he quotes a more liberal rule, made by Ibn Al-Hasaar, a key figure in the abrogation scholarship,
إنما يرجع في النسخ إلى نقل صريح عن رسول الله صلى الله عليه وسلم أو عن صحابي يقول: آية كذا نسخت كذا، ولايعتمد في النسخ قول عوام المفسرين بل ولا اجتهاد المجتهدين من غير نقل صحيح أو معارضة بينة
Translation: For abrogation, reference can only be to direct quote attributed to the Messenger of God, peace be upon him,
or a Sahaabi saying: Such verse abrogated such verse. And abrogation cannot depend on what
common exegetes say, nor analysts conclude, without an authentic quote
or a clear argument. Emphasis mine.
The additional conditions stated by Ibn Al-Hasaar, which I emphasized, are simply, with all due respect, his opinion. They have no basis.
The reason is simple: If abrogation is not explicitly made by the only ones who have the authority to make it, then it is subject to opinion and opinions vary. Thus the truth about it can never be found.