How do intransitivity and ʿilāj differ here?

Characteristics of Form VII (Infiʿāl): Intransitivity, Manifestation, Resulting Action, Equivalence, Root Restrictions and Independent Use

• Both are merely conjugation labels
• ʿIlāj always means past passive
• Intransitivity is only a weak-letter change
• Intransitivity concerns objects; ʿilāj concerns manifestation