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That's coming from the gas plants in SA that are required to provide network inertia

They're currently working on replacing that with battery

(this is explained in the article)

Is there a date when the existing gas plants will be decommissioned and demolished?

Good question, all the emitted CO² stays for centuries in the atmosphere. What is happening if in the end they can't replace all those "dirty" backups ?

This whole plan will basically work only if this big "if" is solved and deployed.

That's false, they're not at all working on replacing gas. In fact, they're quadrupling down on gas (because it's basically a necessity for baseload capacity). [1] [2]

[1] https://www.minister.industry.gov.au/ministers/pitt/media-re...

[2] https://www.murrayvalleystandard.com.au/story/6607101/650m-g...

Reading the article may help. The article states that it was a temporary event.

That's ~30hrs after the point in time highlighted by the article.