أما تسميته بالمنطق فلتأثيره في النطق الظاهري، أعني التكلم
It is called manṭiq because it affects outward speech, that is, speaking.
Outward speech means expressing meanings and arguments in words. Clear concepts and well-ordered reasoning enable a person to present a case in an intelligible sequence.
This is not merely eloquence or attractive language. The relevant gain is presenting a claim, evidence and conclusion without confusing their roles.