how is it not? Finland cuts down hundred of millions of trees every year. they grow back, that's how their lumber industry works. Google presumably cut trees that were of a random age, not of harvesting age.

I realize it is seasonal, but the maths still works. distribute all trees in cohorts of three hours age. every three hours they move one up. every three hours there's 250k trees more over the entire range, allowing Finland to cut the mature trees to make paper.