Is the mention of the story of Ibn Umm Maktum as evidence for the Prophet's prophethood authentic?

Question:
He says (may Allah preserve him): Is the use of this story as evidence for the prophethood correct or not?

Answer:
There is no doubt, yes. He says: Honorable Shaykh, may Allah grant you success. His argument regarding the conveyance is that he conveyed it (peace and blessings be upon him), and he is cited as evidence for the conveyance that he did not conceal anything of the Qur'an, but rather he conveyed this Qur'an to the people; he conveyed to them what was revealed to him from his Lord. In this is a refutation of the Shi'ah, who say that the Messenger concealed knowledge and did not disclose it except to 'Ali alone, concealing the knowledge from others and not disclosing it except to 'Ali ibn Abi Talib. And 'Ali (may Allah be pleased with him) says: