There's also a question of how good these plans are for the ecosystem as they tend to plant all the same tree in tight spaces so they wind up competing for resources and driving out other parts of the system.
I think surveys for five years survival are still being done, but an earlier survey by WWF found 70-85% survival rates for earlier stages in the life of the trees [1].
Regarding your point, yes, there is a lot of problems in the project with monocultures being planted, especially comprising non-local ones. This is a complex political problem because you want to incentivize planting, but cost of planting "multi"-cultures is much higher.