Hence the description "Custom Support Updates", AKA internally for paid companies
it had been known for years that XP SP3 got those custom unpublished updates, but now we know that W2k and W2k3 got them too
custom updates for W2k started in 2014-06, at the same time when the custom support program started for XP SP3
the links are public, the updates are not blocked for installation, what would be suspicious?