The conjecture that the Wada polynomial is the Alexander polynomial at $t=-1$

For a knot, let the Wada polynomial and Alexander polynomial be the knot invariants defined from representations of its braid group by automorphisms of a free group. Specialization conjecture. The Wada polynomial is the specialization of the Alexander polynomial at $t=-1$. This is suggested by the computed examples of torus knots and links, the figure eight knot, the square knot, and granny's knot. The source notes that a proof can be recovered from results of Tetsuya Ito, Wada, and Sakuma.