It's blank for sure. You'll get to do what you want with it. That is a crispy new looking fence.
Did you mention pulling up plants are your old place or am I getting my moving people confused?
Tubestock natives are usually cheap and often sponsored by councils or bush regeneration projects.
If you go back on your son receiving this gift, it'll be a dick of a dad move. Like some people have mentioned your best bet is probably to have a discussion about wealth and ethics with your son as well as letting him know your concerns. Like some people say, it's a lot of money for YOU, for these people it's not.