وَقَدْ زَالَ ذٰلِكَ الإِسْنَادُ الْمُفِيدُ لِهٰذَا الْمَعْنَى
That attribution which conveyed this meaning has disappeared.
The objection is that an initial predication to insān and a new predication to kull cannot simply be described as reinforcement of one and the same attribution. Emphasis needs a clear relation between what is reinforced and what reinforces it.
One reply holds the resulting proposition constant and treats kull as confirming its extension to every member. That reply still requires an account of the relevant scope and context.