Well, the assertion a reliance on fingerprinting is a problematic analogy because the Court has never directly decided the issue of whether fingerprinting to solve a crime is permissible is a substantive rebuttal. I am not sure how exactly or why you think otherwise.
However, J. Scalia made several points in his dissent and to deride his dissent as “not a substantive rebuttal” on the basis of, ostensibly, a single point you disagree with does not make sense.