The Chinese room metaphor is an argument about AI, or computation more generally, attempting to distinguish the difference between performance metrics and "understanding".
There is the role of the human within the metaphor, and the argument/position of the metaphor as a whole. I don't think it makes much sense to talk about the "point/argument/position of a single component of the metaphor. At least, that wasn't how it was originally structured.
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
There is the role of the human within the metaphor, and the argument/position of the metaphor as a whole. I don't think it makes much sense to talk about the "point/argument/position of a single component of the metaphor. At least, that wasn't how it was originally structured.