The later discussion distinguishes one concept from many instances. A kind may have a unitary meaning while its extension contains many people or objects. Exhaustive inclusion applies a statement to the relevant members falling under that meaning.
For instance, “human” denotes a kind even though there are many humans. “Every human is mortal” takes one classificatory concept and distributes a claim across its instances. Likewise «الإنسان» can serve a generic reading in one context and an exhaustive reading in another.
The article, the predication, and contextual cues jointly determine interpretation; singular morphology provides no unrestricted rule that every occurrence must be universal.