The statement of some scholars regarding a narrator: "His hadith is hasan." Is this considered?

The questioner: My Shaykh, we have two hadiths in this issue. I have a small observation that I hope you would address, and you as well when mentioning what confused the brother. He says that in the index of narrators at the end of the printed book, it writes for this narrator: "His hadith is hasan" or "His hadith is weak." In the corroborating narrations and supporting chains, this would be a facilitation for students of knowledge like us who are ignorant, meaning one can reach it quickly.

The Shaykh: Your statement is correct, but there are narrators for whom it is not easy to give this brief description in a single sentence. This is a correct statement, but it cannot be applied universally. Yes.

The questioner: In the case of ... al-Abbas, many of the researching brothers ... and he is one whose hadith was not weakened, but rather his hadith is hasan. Is this correct?

The Shaykh: I did not understand what you said?

The questioner: In the biography of Ubayy ibn al-Abbas.

The Shaykh: What is his name?

The questioner: Ubayy ibn al-Abbas.

The Shaykh: Ubayy ibn al-Abbas. Yes, this is the son of Abd al-Muhaymin, perhaps.

The questioner: His brother is Abd al-Muhaymin ibn al-Abbas.

The Shaykh: Okay, what about Ubayy ibn al-Abbas?

The questioner: He mentioned the statement of those who weaken [narrators].

The Shaykh: Excuse me, who mentioned it?

The questioner: Imam al-Dhahabi in Mizan al-I'tidal, then he came at the end and spoke, saying he is one whose hadith is hasan. Is this correct, because in a hadith of al-Bukhari he said ... .

The Shaykh: I do not remember the actual matter right now, but I recall that there is a discussion regarding al-Bukhari's extraction of it. As for now, nothing comes to mind.