What is Hysteresis Boost?

I am reading the datasheet for the ADP5092 and they reference "hysteresis boost."  I understand what a hysteresis regulator is for lowering the voltage, but what does it mean in the context of the ADP5092?

What I'm specifically wondering is this.  Can the output be boosted to 3.0 or 3.3 Volts even if BAT (in my case a supercapacitor) is actually only say 2.5 volts, and there is no VIN (the PV cell is in the dark)?