The things that truly “help them” are listed above. Cutting trees with lots of buds on top is probably #1. Like super thick hickories that need thinned anyways. Spend a day thinning them and it will help. Same with alfalfa bales.
Clearly we all know that deer without corn around - throwing corn out is very bad for them.
Woody browse vs an area without any is a HUGE difference in winter survival. Along with thermal cover like cedars, switchgrass, etc.
When snow is 2-3’ deep- yikes, ya, back to betting on deer being survival machines to come through like they have for many years. But it sure has to wipe a lot out if they never do reach that good woody browse & thermal cover. Which- those 2 things can be fixed. I’d suspect those areas in N where clear cuts are coming back for example - have a far better survival rate for deer vs the open forest that’s never been touched with nothing on bottom for deer.