I think To teach someone the state which is ‘stateless’, it is necessary to use the concept of ‘state’. Because we can think and understand only in terms of state…so even ‘stateless’ is like certain state for us…but in reality it is not ‘state’! If it was any state, it wouldn’t be ‘stateless’!
In the same way, buddha used proliferated to teach about unproliferated.
I think it is always proliferating, when we try to understand from any point of view. We always have point of view! But to see it clearly, we have to relinquish point of view. Whenever term ‘understanding’ comes, pov is there. Ultimate truth is seen only without point of view. So whenever we say ‘the all’ we are proliferating the unproliferated. Hence buddha said it is beyond ‘the all’. Off course in the end, even ‘the all’ is also just a concept! It is like trying to find the shape of something which is shapeless!