What is the precise significance of “lam yuḥfaẓ ʿanhum samāʿ ... fī riwāyah bi-ʿaynihā”?

Historical Examples of Muʿanʿan Transmission and the Conclusion of Muslim’s Introduction

• Those Successors never heard any Companion
• Every link certainly contains an omitted intermediary
• The particular report lacks documented explicit hearing, not proven non-meeting
• Every related matn must be anomalous