There have been a few pigs up the top near Gebbies Pass some years back and all that would needed is exclusion of honest hunters for them to build up. The article does mention the past populations. No need for any new release.
I dont know much about controlling pig numbers but a start might be to facilitate permitting of hunting with dogs in the private farmland, plantation and small areas of reserves so a trusted team could range wherever the pigs are on the day.
Fallow and goats are probably easier to control ( never heard of goats in that area) and again probably what's needed is permission for a a contractor to cover the area without boundaries which might be what the informant had in mind that they'd get the job.
The photo under the Bush isn't pig damage. Unlikely for deer to build up to such levels close to town either (and falllow live on grass) so probably what they really need is a stock proof fence.
Bookmarks