Speed at the time of engine failure is a factor on certain A320s.
OEB 154-2A refers.
In this case a design flaw in the software allows the speed to target that value which was being flown at the time of the failure, when SRS mode engages (in your example, google, 250 knots).
In the event of a One-Engine Inoperative go-around, the OEB requires that the current speed at the time of the go-around be selected and then reduced to Vls in order to allow the aeroplane to climb away safely.
If during your PNF Cockpit Prep flows you notice that your aeroplane's QRH has a specific OEB entitled "SPD TGT AT GO AROUND OEI", this is what it is referring to!