The unfiltered Hochschild–orbifold cohomology conjecture for projective symplectic quotient orbifolds

Let $\mathscr{X}$ be a projective symplectic quotient orbifold, and write $H\! H^\bullet(\mathscr{X})$ for its Hochschild cohomology and $H^\bullet_\mathrm{orb}(\mathscr{X})$ for its orbifold cohomology. Unfiltered Hochschild–orbifold cohomology conjecture. There is an algebra isomorphism

$$H\! H^\bullet(\mathscr{X})\cong H^\bullet_\mathrm{orb}(\mathscr{X}).$$

This is stronger than the associated-graded comparison and is stated as strongly related to a conjecture of Ruan. The supplied source gives no resolution.