My point was not that we have a limited perspective on a grander reality, but that reality is fragmented into limited perspectives. The point of saying there is no "cosmic perspective" is to not to say that "reality doesn't exist," but to say that reality does not consist of a cosmic perspective.

Your conclusion in fact contradicts yourself. If you agree that there is no cosmic perspective, then you cannot conclude "we are not perceiving reality as it really is," because this still implies there is a cosmic perspective out there but we are incapable of seeing it.

If you reject such a cosmic perspective even exists, then you cannot conclude we do not perceive reality as it is. Reality is, in a sense, perspectivist, and so it is only natural that if we perceive reality as it really is, we would perceive it from a particular perspective.