I am going to suppose something here. Cannot say it as a fact.
And as I suppose this, it is possible that the situation is only localized, despite my sureness that it is not.
Ok, so all that code is important to remember as I go along.
Suppose a foreign language congregation has some children that belong to schools where "worldly" people also speak that foreign language. Some parents get lists of other parents' addresses. Suppose some congregation members belong to various aid-groups for people within that foreign language culture. They might also obtain lists of addresses.
Such various lists would be technically "illegal" in many cases to share with others outside of that group, no doubt about it with school lists. It certainly would violate the intent of those who shared it with the foreign language JW to begin with.
So suppose a congregation just incorporates those lists into its database and destroys the original lists they came from, therefore allowing every single member to say to the 'householder,' "No, I don't know how your name and address got onto the list. I do know that you live in an English-speaking neighborhood, so perhaps our English-speaking Witnesses made note that you were [not English-speaking]."