Holonomy Chen ranks conjecture for simple matroids

Let $\mathsf{M}$ be a simple matroid. For each sub-matroid $\mathsf{M}'\subset \mathsf{M}$, let $n_k(\mathsf{M}')$ be the number of $k$-multinets supported by $\mathsf{M}'$, and let $\theta_r(\mathsf{M})$ denote the holonomy Chen ranks. Holonomy Chen ranks conjecture. For $r\gg 0$,

$$\theta_r(\mathsf{M})=(r-1)\sum_{\mathsf{M}'\subset \mathsf{M}}\sum_{k\ge 3}n_k(\mathsf{M}')\binom{k+r-3}{r}.$$

This generalizes the Chen Ranks conjecture for arrangement groups. The supplied text does not state whether the conjecture has been resolved.