I have long been under the impression that the 'backup rules' will be called into play in 2020 regarding the congressional map, because the GOP would want to protect Stefanik's path to leadership, and her seat could get bluer once NY-22 gets cut. So they will sign on to some dem 'protections' in order to protect her, and a few others. But hey, maybe the initial map will appease them, or perhaps Stefanik's leadership path is now shut with the Trump turn of the GOP.
NY-22 being eliminated probably helps Stefanik - her seat could stand to gain parts of Oneida, which is reliably R turf.