Sue, by re-wilding they mean the movement that encompasses primitive skills, wildcrafting,
eg re- becoming-wild human.
In this context it's another elitist word just like 'permaculture'. The only folks who know what it means are a sub-culture. I use both words, but realize it needs explaining the first time. There's a similar blog to this one about rewilding at
http://www.rewild.info/conversations/ On the topic at hand, I'd add that it seems to me that the re-wilding movement (of which I have limited knowledge) doesn't tend to think that gardening is an act of wildness.
But, a look at history shows many instances of indigenous groups gardening, and that gardening tends to blend into the landscape in a very hard-to-recognize-to-whitie/ permaculture type way. The books Mt.Goat mentioned above, and 'Tending the Wild' (easier to read) explore this topic a lot. The book '1491' also.
So it's kind of a semantic thing. What is wild? Not obeying rules? Or only obeying rules that come from a tribe? And which tribe? Not tending to food? Or tending food plants/animals as best befits your ecosystem? What exactly does 'wild' mean, and is it a European way of just rejecting domination in all its forms? does that mean throwing out tradition as well? (that of course brings in more topics)
I want to learn a lot more about many topics re-wilding folks are into. And if I knew more I wouldn't hesitate to use the word 'rewild' for one of my approaches.
BUT I'm hesitant to reject the notion that humans only belong in their ecosystem as hunter/gatherers.
As Jon Young said in a lecture/story I heard from him (very appropriate for the topic since he's a primitive skills guy): "We are the duct-tape generation. We don't know what traditions to hold on to. We don't know what traditions to create. And we'll have to duct-tape our lives together in some kind of way, hoping that our children will then have something more healthy and holistic to work with. We don't have the luxury of growing up in an intact healthy culture, so we'll have to create it"
I wouldn't throw out gardening (or permaculture, to get into semantics), it might kind of be like throwing out the baby with the bathwater. Sure, industrial ag needs to be rejected. But so might the notion that we only mess up ecosystems when we start to interact.
These tribes didn't create traditions of gardening certain plants for nothing. The plants need us, is a common theme I've heard.