Reforestation, or at least the planting of millions of trees and plants is actually creating more foliage than is being lost in the Amazon. The losses in the Amazon are catastrophic and need to be addressed. At the same time, massive efforts have planted enough to add 5% to the world’s leaf cover in the last 20 years.
The good news is that such efforts prove positive progress can be made by humans. If such efforts were continued and the Amazon wasn’t being deforested, the benefits would be amplified. As is true of any such advances, conditions may change to increase or decrease the effect. While that is typically true and somewhat trite to mention, it also reflects that such efforts occur within shifting climates, both atmospheric and political.