This proposal is to transfer the Moonbeam treasury’s remaining funds back from Hydration to Moonbeam, now that the the rolling DCA has been terminated. For more details on the DCA trade, see Proposal: Transitioning the Moonbeam Treasury to Stablecoin Payments.
The Moonbeam sovereign account in Hydration still holds the leftover GLMR (never sold) and the USDC accumulated by the DCA. Both are owned by the sovereign account, so the transfers must be signed by it. When executed, this proposal routes the transfers them through an XCM transactThroughSovereign, so Moonbeam governance (Root) executes them as the sovereign account on Hydration.