। ॥ ५२ ॥
In plain words
Suppose someone says non-duality — the one real thing — is superimposed on duality, which is unreal. That will not hold. Superimposition works the other way: unreal things get laid over what is real.
Close to the Sanskrit
If non-duality, the real, were superimposed upon unreal duality — that is untenable indeed, because superimposition of unreal things occurs upon the real.