I haven't been able to read all the links yet, but I think the following is problematical for them:
Data protection policy on jw.org says under point 7:
Personal data will not be transferred between branches unless necessary to accomplish the religious or charitable purposes of the organization of Jehovah’s Witnesses, to which all Jehovah’s Witnesses have consented by virtue of their free and willing decision to become and identify themselves as Jehovah’s Witnesses.
Having been baptised in the early 70s as a young teen in the US, I certainly was never asked or made aware of the records that the Society has kept on me. I am sure that has not changed today. When you open a bank or credit card account, you have to sign a form saying you understand privacy policy, and you get updates in the mail when the policy or the law concerning that has changed. So, how do they think they can prove the (untrue) statement above? Unless things have changed, they don't have signatures on file for each publisher giving permission to collect/keep personal data. Perhaps if they enforce a system where everyone must log in to JW.org to get literature, see videos, and make contributions (with individual accounts with passwords) they will try to sneak this in as well. It will be interesting to see how this plays out.
Perhaps the cart witnessing with no not-at-home records (I remember those forms, and turning them in to the congregation with the territory) is a way they've come up with to address this?