Specialization formula for the adjoint HOMFLY invariant

Let $K$ be a $0$-framed knot, let $U_0$ denote the unknot, and let $H_{\operatorname{ad}}$ be the adjoint HOMFLY invariant. Let $f$ be the ring morphism used in the paper, and let $V_2(K)$ be the standardly normalized type $2$ Vassiliev invariant. Set $\sigma_+=(q_1^2+q_2^2+q_3^2)$ and $\sigma_-=(q_1^{-2}+q_2^{-2}+q_3^{-2})$.

Specialization conjecture.

$$\left.\frac{\frac{f(H_{\operatorname{ad}}(K))}{f(H_{\operatorname{ad}}(U_0))}-1}{\left(v-\frac1v\right)^2}\right|_{v=1}=-2V_2(K)-\frac1{z^2}\left.\frac{\widetilde Q(K)}{\sigma_+-\sigma_-}\right|_{\sigma_+=\sigma_-=z^2+3}.$$

The source states that this conjecture follows from work of N. Geer, so it is presented as resolved rather than open.