Why is the attribution about Ibn Masʿūd at Ṣiffīn rejected?

Narrator Criticism: Corruption, Concealed Sources and Chronological Testing

• Because the term Ṣiffīn was unknown in Arabic
• Abū Wāʾil transmitted no other hadith
• The wording occurred only in long chains
• Ṣiffīn occurred after Ibn Masʿūd had died