Supersignature unknotting-number bound

Let $u,v$ be parameters and let $L$ be a link for which the supersignature $\sigma_{u,v}(L)$ exists and is finite. Let $u(L)$ denote the unknotting number, and let $T_n$ be the trivial link with $n$ components. The supersignature unknotting-number conjecture.

$$u(L) \geq \begin{cases}\dfrac{|\sigma_{u,v}(L)-\sigma_{u,v}(T_n)|}{2},&u\ne v,\\[6pt]\dfrac{|\sigma_{u,v}(L)|}{2},&u=v.\end{cases}$$

This proposes a supersignature analogue of the classical signature bound for unknotting number. The supplied status evidence identifies the associated supersignature existence problem as open, and the text gives no resolution of this proposed bound.