The SubContinent is part of Asia. In America people typically assume Asian = East Asian, but this designer is from New Zealand. In Britain , Asian = Indian/Pakistani/other South Asians. Australia and NZ are heavily influenced by Britain. I don't know where the Aussies and Kiwis exclusively use "Asian" to denote East Asians ;
@Ruprecht could tell us. If they do, then it is understandable that she didn't feature any South Asians, but what's the reason for no dark skinned South East Asians ?
And even in the US, South Asians are classified as Asian. The designer said "Asian group" , not "East Asian" or "Far Eastern" or "Oriental" . And Oriental isn't a slur; it is used in Britain to describe Far Eastern peoples and no one considered it a slur.