Most people were wrong. Paul Dennehy’s explanation of why the reindeer are captive applies to those tuatara as well.
“Translocation of the founding population” is unambiguously “because a human intended for them to be there.” And the hatchlings born in the enclosure – well, with plants, we only count seedlings as wild if they have spread “outside the intended gardening area.”
I’m not sure that “countless” is literally true in this context, because the species monitored for disease and illness are a subset of the known species. That isn’t pedantry; it is a useful distinction in determining the degree of wildness.