The objection is to “redistricting.”
The objection is to the validity of this particular referendum based on a few, distinct, but rational, bases They include the improper phrasing of the referendum issue on the ballot, the legally invalid procedural manner n by which that state legislature propelled the referendum to a vote and the lack of a legally required second vote on it.
Had it been proposed and worded properly, etc., this wouldn’t be a valid legal dispute. For, in that case, the Va residents would have spoken. Now? Not so much.