But there is no way to make that claim about Kant and Critique of Pure Reason. The logic underpinning such an argument - that Kant's view of the mind does not match popular current scientific theories and therefor does not constitute science - would also place Newton's Principia outside the realm of Physics.
To suppose that the thrust of Kant's categories do not underpin modern psychology one would have to be the most radical of behaviorists. Modern psychology readily accepts that a person's experience of the world is largely shaped by the features of their mind - e.g. reframing.
[http://en.wikipedia.org/wiki/Reframing]
As for what psychologists claim as their epistemological basis, I suspect that the rate at which psychologists would claim James as a predecessor is significantly greater than the rate at which planetary astronomers who would claim Giordano Bruno's work as their epistemological base.