What is the status of “bi-ḥasbi al-marʾ ...” attributed to ʿUmar?

The Prohibition on Relating Everything Heard: Verification, Selection and Audience

• A Companion’s statement, not independently marfūʿ in this route
• Mālik’s legal definition
• A Prophetic report through Ibn Masʿūd
• A denial of the transmitted matn on grounds of precision