Residue mirror symmetry for Grassmannian quasimaps and gauged linear sigma models

Let $G$ act on a $G$-space $V$, and let $W\subset V$ be the zero locus of $G$-semi-invariant polynomials $f_i$, for $i=1,\ldots,r$. For $P\in\mathbb{C}[\mathfrak{t}]^{\mathcal{W}}$, write $\langle P\rangle_{W\mathbin{\mathrm{GIT}}G}$ for the generating function of quasimap invariants, and let $\operatorname{cor}\{P\}$ denote the corresponding correlation function of the A-twisted gauged linear sigma model with potential $\sum_i f_i p_i$ on $V\times\mathbb{A}^r$, where $p_i$ has R-charge $2$. Residue mirror symmetry conjecture. Provided the conditions in Sections C1 and C2 hold, for every $P\in\mathbb{C}[\mathfrak{t}]^{\mathcal{W}}$ one has, up to an overall sign,

$$\operatorname{cor}\{P\}=\pm\langle P\rangle_{W\mathbin{\mathrm{GIT}}G}.$$

This predicts equality between quasimap invariants and A-twisted GLSM correlation functions, but the supplied text does not state whether the claim has been proved or remains open.