PilotJames
STS page is part of ECAM so it is always dynamic with failures. Let's say you have slats jam the STS page gives you Vref+25. This is a speed additive to Vref to know Vapp. When you start configuring by taking flap it will still show Vref+25 but while selecting flaps if you get a flaps jam the STS page will take a note of it and give you different additive may be Vref+60 or alternately if you recover some slat as Pony stated it will may give you Vref+10.
It says the approach speed correction on the status page is dependent on current flap and slat position and is updated for landing?
It means dependant on current flap/slat jam position not on configuration. It will only change if the jammed slat/flap position changes.