No that is incorrect, the ACCC said:
"The ACCC says its snapshot study showed that Coles Express was the first to raise prices in Sydney, Melbourne, Brisbane and Adelaide yesterday."
That means that Shell could be doing the weekly price hike of 12-16c/L at say 1pm where as all the other brands are doing it at 2pm - it doesnt mean that Shell are selling at a higher price than other brands, they are just bumping the price BEFORE others.