Its just a hypothetical where the government somehow screws up the post-2008 recovery, GDP contracts more than 2.8% in 2009, doesn't recover 2.5% in 2010 and remain at said levels. A simple trajectory of -4%, +0.5% and 2s thereafter would get you there. If the recovery had gone like that unemployment would've been higher throughout, and they move kind of concurrently.
No great insight to be derived from these imaginings, my point was only that actions of the government since 2009 that helped the economy not contract more have large significance to the well-being of poor and lower middle-class population, since lower income and employment would hit them hardest (as it always happens when there are economic troubles).