I think Biden's actual total vote number was about the same as Hillary's.

Biden performed worse than Hillary across the board, even in counties he won.

The only areas he performed better were almost exclusively the 4 metropolitan areas that he needed to carry PA, GA, WI, and MI. Ignoring the shenanigans in Maricopa AZ, NV, and possibly other states where his performance was slightly better than Hillary's for reasons that can only be explained through fraud.