Confusing statements regarding the hadith in At-Tirmidhi, is it hasan gharib or hasan sahih?

There is a hadith narrated in At-Tirmidhi and it states that it is *hasan gharib*. > Thawban (ra) said: “The Messenger of Allah (ﷺ) said: ‘Whoever says when he reaches the evening: “I am pleased with Allah as (my) Lord, with Islam as (my) religion, and with Muhammad (ﷺ) as (my) Prophet (Raḍītu bi-Llāhi rabban, wa bil-Islāmi dīnan, wa bi-Muḥammadin nabiyyan) it is a duty upon Allah to please him.’” (Hasan Gharib) But in the book of An-Nawawi (Kitab al-Adhkar - Book of Rememberances), I am reading this: "Its isnad includes Said ibn al-Marzuban Abu Sad [...] who is considered weak[, ...] however, [He] considered this to be a *hasan sahih* hadith which is unusual in this narration; so perhaps it was *sahih* in his view from another narration." Those are confusing statements to me, and I would like to know if there are further information or commentaries regarding this issue from other scholars?