She's absolutely correct about Russell. But her statement doesn't address the problematic "gap" between the "knower and thing known." I don't recall her addressing the issue in any of her writings.
So, I question the author's motive? What is the underlying objective of the "Thomistic Philosophy Page"?
Is it an attack upon reason?
She didn't. There is no such, "problematic 'gap' between the "knower and thing known." In fact, the, "knower," is as much a, "thing known," as any other thing. There is no, "gap," it is the invention of the mystic schoolmen.
It also confuses the real question which is how do we know anything, or epistemology. That Ayn Rand addressed very well.
Hank