The Chinese Room metaphor is yet another one of those arguments that fails to take into account that humans are a bag of functional proteins. There is no soul anywhere in the human body.
In other words: it's an argument that would work perfectly fine to defend the idea that humans have no consciousness.
Ergo it can only really prove that either humans have no consciousness/soul/... (whatever you name the magical human property) or that it doesn't exist at all.
That is a pretty simple grasp of the example. It doesn't claim that no system can have understanding or consciousness. It just demonstrates that performance alone is insufficient to conclude consciousness and understanding. A calculator or abacus can add 2 + 2 but instead self aware
In other words: it's an argument that would work perfectly fine to defend the idea that humans have no consciousness.
Ergo it can only really prove that either humans have no consciousness/soul/... (whatever you name the magical human property) or that it doesn't exist at all.