Elementary reading skills suggest this means they lived in DC for some significant period of time prior to 2017 as a WP reader, moved away from DC for some unknown period living elsewhere as a non-WP reader, moving back to DC in 2017 when they started reading WP again.
They noticed a decline in quality from before and after the acquisition and are using that to conclude that the acquisition didn't impact the quality of the paper. Again, that certainly seems like a strange way to make the point that the purchase didn't impact its quality.