Shahidi's generic cuspidal representation conjecture for symplectic Arthur packets

Let $\phi=\boxplus_{i=1}^r(\tau_i,1)\in\widetilde{\Phi}_2({\mathrm{Sp}}_{2n})$ be a generic global Arthur parameter. Here $\widetilde{\Pi}_{\phi}({\mathrm{Sp}}_{2n})$ denotes its global Arthur packet, and $\frak{p}^m(\pi)$ denotes the set of maximal partitions attached to $\pi$. Shahidi's conjecture. There is an irreducible generic cuspidal automorphic representation $\pi$ of ${\mathrm{Sp}}_{2n}({\mathbb A})$ belonging to $\widetilde{\Pi}_{\phi}({\mathrm{Sp}}_{2n})$, and hence

$$\frak{p}^m(\pi)=\{[(2n)]\}.$$

The conjecture has been proved using the automorphic descent of Ginzburg, Rallis and Soudry.