I don't think that chart is describing actual canopy coverage or timber supply.

Since 1630, about 256 million acres of forest land have been converted to other uses—mainly agricultural. Nearly two-thirds of the net conversion to other uses...

It's a land area/land use statement. Clearcut scars in Forest Service land are, more than likely, still considered forest land.

The general fight I remember from the 80's-90's timeframe was over clearcutting old growth, mainly in the Pacific Northwest.