That seems to be the case. I am not an expert on the subject, but I understand that all parties have some information that comes from the voters' list.
You say that the information does not give you the minimum amount of information you need to communicate with electors. So that is a valid question that can be studied. You could look into the matter.
On the other hand, when I talked about a gray area, it was in the sense that, since I do not have the jurisdiction to verify how the parties use the information, I do not know what is going on. Parties have privacy policies in place to ensure a minimum of rules in their dealings with voters. However, neither I nor any other independent person can verify what is happening. So that's what I meant by “gray area”, an area with no independent arbitrator who can ensure that the rules in place are followed.