The XCM contained in this proposal does express the request to open a channel to Statemint. Once approved by the governance body, the channel request has also to be approved by the governance body of Polkadot before it becomes active.
The reason behind this proposal is to prepare the onboarding of USDT on Zeitgeist. Due to technical reasons the usage of USDT in markets is not completely supported yet, however, since the Polkadot governance body moves slowly I'd like to ensure that the channel is ready once USDT support in markets has been added to the runtime.
The XCM within the calldata of this proposal is sent to Polkadot, which then executes the calldata 0x3c00e8030000e803000000900100 that is contained within this XCM. The dispatchable call that is invoked on Polkadot is the following: hrmp.hrmpInitOpenChannel(1000, 1000, 102400).