How should Ibn ʿAbbās’s forceful statement about a ruling attributed to ʿAlī be read?

Avoiding Unreliable Transmitters: Critical Reception of Reports and Historical Claims

• Ibn ʿAbbās established that ʿAlī in fact issued an unjust judgment
• It sharply challenges the attribution, not ʿAlī’s integrity
• It is a legal verdict directly pronounced by the Prophet
• The text has no Companion attribution in the source