From that article:
Of course, official figures may not agree. Inflation and cost of living data tends to vary a lot in Dubai because the population itself varies so much: it’s hard to pin down one “average” consumer, given the wide range of cultures, incomes and lifestyles in the city. Moreover, UAE Nationals benefit from subsidised or free healthcare, education, utilities and housing, so an official “inflation” rate of --% may be true for Nationals, but wholly inaccurate for the remaining 85 per cent of the population....
Very true.