I've visited many of the spots mentioned in this article. I haven't checked all of them, but all the ones I have checked have _no_ manual replanting to date, that I can see. (I'd expect a grid, with trees with those little fences protecting them, etc.)
What I do see is just natural growth of various plant species taking advantage of open ground, a mix of grasses, shrubs, birches, and others. There is no sign, that I have personally seen, of the ground being restored, or of systematic replanting. I write this noting I have not been to every site, so I can't definitely state there's been zero replanting. Some places were so lovely I just don't want to revisit :(
I picked a lot of wild strawberries on one of these plots of land just a couple of weeks ago. It used to be damp soil even in summer, lots of moss, mist commonly held between the trees (there's a photo.) Now it was baking hot with deep trenches from the machines. But hey. Hiding among the undergrowth there were strawberry plants.
_Something_ will grow back. Often in these things the replacement ecosystem is very different.