It depends on what the meaning of "person" is. I deliberately put that in the form of the notorius Clintonism (of which you recently spuriously accused me) but it isn't one. The word "person" has several senses and saying (rightly or wrongly) that someone is not a person is not necessariily the same thing as saying they are not a human.
I think Taney's imitators in Roe v Wade said something like that too, but is that what your really think? How can a "person" not be a "human"?