Rectifiability and backward uniqueness conjecture for the top Ricci flow singular stratum

Let $(Z,d_Z,\mathfrak{t})$ be a noncollapsed Ricci flow limit space arising as the pointed Gromov--Hausdorff limit of a sequence in $\mathcal{M}(n,Y,T)$. Let $\mathcal{S}_{\mathrm{F}}^{n-2}$ denote the $\mathrm{F}$-stratum of the singular set of dimension $n-2$, and let $\Gamma$ be the finite group appearing in the corresponding tangent flow. Rectifiability and backward uniqueness conjecture. The set $\mathcal{S}_{\mathrm{F}}^{n-2}$ is vertically parabolic $(n-2)$-rectifiable with respect to the $d_Z$-distance. Moreover, for $\mathscr{H}^{n-2}$-almost every $x\in\mathcal{S}_{\mathrm{F}}^{n-2}$, the tangent flow at $x$ is backward unique, and its negative part is given by

$$\mathbb{R}^{n-4}\times(\mathbb{R}^4/\Gamma)\times\mathbb{R}_-.$$

If true, then together with the paper's rectifiability theorem for the other singular strata, this would imply that the entire singular set $\mathcal{S}$ is parabolic $(n-2)$-rectifiable. The claim is proposed in general dimension; the supplied text gives no resolution, so its status remains open.