This tradition from the Prophet ﷺ without mentioning the name of the Companion in the chain (in the mursal form). Abu dawud said: I heard Muhammad b. Humaid say: I heard Ya'qub say: Anything I narrated to you from Ja'far on the authority of Sa'id b. Jubair from the Prophet ﷺ is directly coming from Ibn Abbas from the Prophet ﷺ.

عَنِ النَّبِيِّ ﷺ بِمَعْنَاهُ مُرْسَلٌ