“ Kant’s position is that we can conceive of things only as they appear to us and never as they are in themselves. How things are in themselves is out of the reach of our thought.”
Surely this begs the question that the existence of an objective reality may itself be in question? I don’t actually accept either that logic or Kant’s proposition anyway, because the argument seems predicated on a rather classical notion of what our senses are.
What seems now true is that the senses we have are the tools available to us for perceiving reality, and these are not merely the biological systems each individual human possesses, but the technological and social infrastructure that humanity builds and maintains. Thus we cannot directly “see” microbes, yet we know their existence to be certain, for instance. As we extend our collective systems of perception and explanation, we actually extend the boundaries of our perception and therefore must, by definition, edge ever closer to making reality directly perceivable.