The judge decided that small parties should have had the same access to voting information as the larger parties. And will not allow this information to be made available to the Democratic party for potential use this year.
Since that did not happen, Michigan must change its primary system looking forward. Most likely they will hold their primaries on the same date like most primary states do. In that case they vote in one primary or another, but only one vote per person. It is not necessary in that case to have such lists made available.
But the result of the elections was not overturned and there is no guidance as to how the Democratic Party should handle it's Michigan problem other than that they won't be able to access these lists.
And so, it's still the Democratic Party's problem, but there are now less options on how it can be fixed.