DNC is interpreting the rules in a way that'd somewhat (not entirely) flatten that distribution, making it less directly linked to raw turnout.
BUT that's not real issue. Issue is that SDE count is bound to be a mess.
Here's @Nate_Cohn on this same issue:
Again, please read whole thread, it's logical for dispute to have only emerged when it did. Bigger issue is IDP has designed incomprehensibe SDE system.