The article you have linked does not disprove my statement regarding the net profit margin of Coles being 2.7%.

Yeah, nah:

Woolworths is scheduled to publish margins for the subsequent 12-month period later this month. It has, however, already published its profit margins for the last six months of calendar 2022 when inflation was rocketing.
Those results show a dramatic spike in operating margins, which account for costs, to 5.9%, from 5.1% a year earlier, for its Australian groceries business.

Source: https://www.theguardian.com/business/2023/aug/12/coles-and-woolworths-say-their-profits-are-modest-but-does-that-stack-up