While I don't think that there is an issue with JWs having a database of those who are deaf (all of our names and addresses appear on some Compagnie's database), my biggest issue with this article is the lie told by Spinks that there is no database. The other problem is that they keep harassing the same people after being told to not come back, but that's more of an internal communication issue.
How Spinks can say with a straight face that there is no db is beyond me. Every foreign language group or congregation works off of a db of names of known users of the language. I wish I llived in NZ. I'd contact this group and tell them that Spinks is lying to them.