They were (are?) also not counting deaths by visitors from out-of-state.
Even the likes of Belarus, Saudi Arabia, Iran, China, or Brazil seem to have realised either that it's better for them to be transparent, or that fudging the numbers is always going to come out in the end.
I'm somewhat certain such shenanigans are magnitudes worse for a state's image. New York is seen as unlucky, or maybe incompetent. Florida is corrupt. A failed state.