The news article summarizes what some folks on this blog have said:
“The unlogged stands had relatively low fuel loads right after the fire, but the downed wood still ready to burn built up steadily for the next 20 years. The greater amount of wood on the ground remained measurable for 40 years after the burn.
“In the logged stands, the amount of brush and wood and debris on the ground increased right after the fire. That’s probably because the loggers harvested the trunks of the trees, but left behind branches and other debris. After that, the amount of fuel on the ground declined steadily and significantly — without the slow death and toppling of the big trees killed by the initial fire.”
The study looked at fuels, not erosion, habitat, etc.