Does the hadith: "Unless you see blatant disbelief about which you have proof from Allah" mean that it is permissible to revolt against the ruler when there is blatant disbelief, without waiting to establish the proof of the ruler's disbelief, since the revolt is conditioned on the existence of disbelief and not on the existence of a disbelieving ruler?

The meaning of the hadith (definition) about revolting against the ruler refers to his clear disbelief (kufr bawāḥ) that bears no interpretation. However, the establishment of his disbelief does not mean hastening to revolt against him. Rather, that depends on the Shariah interest, and the matter is entrusted to the scholars and those in authority (ahl al-ḥall wa al-ʿaqd).