Your understanding is incorrect. They spent $2B when they purchased the Abbot Point Coal Terminal.
https://uk.reuters.com/article/us-abbotpoint-adani-idUKTRE7421I720110503
Also, I note that my original point about being dicked around and used a political football by both levels of Government went through to the keeper.
That's what investors will be looking at rather than Adani's questionable project development strategy.
Our convoluted, confusing, duplicative and unclear approach to government approvals for major projects undoubtedly presents a sovereign risk.