Saltwater should not affect the plaster so long as you reasonably maintain the water chemistry levels that are slightly different at higher salt levels. Basically, you need a slightly higher pH, TA, and/or CH. The difference in the calcite saturation index is that the SWG pool has it around -0.2 lower than a typical non-SWG pool which is why you need minor adjustments to the water parameters.
The bigger issue for the higher salt level would be splash-out if you have soft stone around the pool. If you have cement or hard stone (i.e. that doesn't absorb much water), then you should be fine. With soft stone, you may need to have it regularly sealed to reduce the likelihood of damage.
Also, if you have an automatic cover with an aluminum header bar that is immersed in the water, you may need to attach a wire to it (or to the bonding wire that should be connected to it) and connect this to a sacrificial zinc anode buried in moist soil. This is to prevent metal corrosion.
