This is a weak and inconsistent narration. What clarifies this is the earlier narration reported by Ishaq ibn Ammar from Abu Abdullah عليه السلام, which mentions the story of the Commander of the Faithful عليه السلام with Miqdad. When Miqdad asked the Prophet (may Allah سبحانه وتعالى bless him and his family) about this, He صلى الله عليه وعلى آله وسلم said: "There is no harm in it." The same narrator has also reported that it is permissible to forgo ablution (wudu’) for madhy (pre-seminal fluid). This indicates that the intended meaning of the narration is a form of recommendation (istihbab).