I don't think it's necessarily a lie. Because of gerrymandering and the prospects for jobs, a lot of people are moving. Red states are becoming more red. Blue states are becoming more blue. It's only recently that NY has this 5 to 3 ratio in favor of the dems, IIRC. Both Schumer and then Hillary won by at least 11 percent margins when they were first elected.
NY, especially NYC, picked up many new residents, not counting those who can't vote legally. Upstate NY lost loads of folks who are unlikely to return. Liberals are flocking to cities. Conservatives are looking to greener pastures. If I wasn't a native of NYC with family and friends still here, I would have left a long time ago.
As a native New Yorker, I weep for my state.