Stoimenow's sign conjecture for amphicheiral Alexander polynomials

Let $K$ be an amphicheiral knot, and let $\Delta_K$ be its Alexander polynomial. Stoimenow's sign conjecture. The sign of the leading coefficient of $\Delta_K$ is

$$(-1)^{\operatorname{max\,deg}\Delta_K}.$$

The conjecture is presented alongside Stoimenow's square leading-coefficient conjecture and is motivated by the same theorem and classes of amphicheiral knots. The supplied text reports that the relevant conjectures are disproved by the paper's counterexamples.