To what extent is the hadith "Siwak is a purifier for the mouth, pleasing to the Lord" authentic, and what is its defect?

The Hadith of the Siwak: "It purifies the mouth and pleases the Lord." It was narrated by Imam Ahmad, An-Nasa'i, Ibn Khuzaymah, and Ibn Hibban, and transmitted by Al-Bukhari as a mu'allaq narration. It was authenticated by Al-Albani and Al-Arna'ut, so it is an authentic hadith.