It in part was a bit of tongue and cheek in response to the SA government spin,
I understand the function/limitations if the battery farm being constructed, however, the SA government has been spruking its benefits far greater than what is the limits of its functionality. If you take the spin from the government literally, the figures outlined are possibly correct.
If one, possibly like many of our South Australians cousins may have thought from the spin, thinks the batteries will not prevent blackouts like those which occurred in the past, then this won't happen. Blackouts will continur to occur due to extreme weather events (such as damage to part of the network), when local generation capacity can't meet demand or there is a interruption in the stability of the whole of the network like that occurred about 12 months ago (including some of the factors you have outlined).
The battery farm should however stabilise short term changes in wind farm generation and also provide some stability relief. Such may reduce the fluctuations inthe SA spot prices which is possibky the main driver of the farm.
The two gas turbines (276MW capacity), will also assist in meeting demand shortfalls, but is worth noting that this generation capacity is less than 10% of forecast peak demand. If there is any failure in the network or loss of generation capacity from other sources which exceed this additional gas turbine capacity, SA is again likely to be in a prediciment again with load shedding or general blackouts.
The risk to loss in SA may have reduced slightly, but there are still significant risks which could w asily be realised. Unfortunately the government spin provides a very optimistic view on the benefits of the gas turbines, mobile gensets and battery farm. I suppose the SA government performance will be judged at the ballot box in the not to distant future.
Getting back to topic, SA is potentially best placed in Australia to host a nuclear reactor if a decisikn is made to build another one. Maybe Sydney's Lucas Heights reactor should have been relocated there instead of its recent rebuild (would have provided jobs to SA)....but again the reactor needs failsafe energy options which I beleive the main eastern grid is one.
SA also has low population densities and has an existing restricted radioactive area which could be connected to the transmission network (at some cost), has some of the most stable geomorphology in the world and massive rocks with out significant fissures for long term waste depositary.
While I am on the fence in relation to nuclear power generation, the waste depositary option has merits as I am a believe that if we produce a product (yellow cake), we should be ultimately responsible for its waste management. Australia may be one of the best options in the world for long term storage, especially since if the products originated here.