الواجب والقديم مترادفان
The claim that “necessary” and “beginningless” are synonymous.
The objection is that necessity and beginninglessness have different meanings. The former indicates existence that cannot fail to be; the latter denies an initial moment of existence. Both predicates may hold of the same reality without becoming identical in meaning.
This is the distinction between concept and referent. “Every necessary being is beginningless” states an implication. “Necessary and beginningless mean exactly the same thing” states semantic identity. Care with that distinction resolves apparent contradictions in theological terminology.