He's from an Asian country, so its understandable that he wasn't aware of why Yellowface is problematic to Western audiences-- especially ones of Asian descent. And it's also understandable that he was unfamiliar with the issue regarding problematic depictions of Asians in our media and the lack of representation they're faced with due to 'whitewashing' of their roles.
In this day and age, as people around the world get more and more exposure to various cultures (and their cultural sensitivities), it's important for all of us to try to respect each others boundaries. It's called "cross-cultural sensitivity" and it's important in today's world, especially for business and organizations participating in a global market/vying for international prominence.
Numéro also did a photoshoot of a black mom and her child...with a black child and a white model in blackface and an afro wig.
http://images.nymag.com/images/2/daily/2010/09/27_numero_560x375.jpg
This is being viewed within the context of the ongoing discussion regarding diversity inside the fashion industry in the Western world. Specifically, the lack of opportunities for many PoC models (due to widespread, exclusionary practices that favor white models). In that context, it is a slap in the face to working PoC models. Having white women getting paid to fill in for them when they are already struggling in the industry is totally inappropriate and it just further marginalizes them. The 'artistic intent' of painting white models darker in photo-shoots or runway shows isn't happening in a vacuum where PoC representation is no longer an issue. I'm sure it's fabulous to be a Temporary WoC, then go off to get booked for the plethora of jobs available to white models only. All while WoC are getting constantly turned away because "that look isn't in/this look is too ethnic/that look isn't appropriate for this show we need a neutral palette."
Furthermore, the fashion industry has a long history of doing problematic things when it comes to race. Fetishizing PoC, cultural appropriation, using PoC as human props in photo-shoots to provide an 'exotic/wild/savage background' for their white models. etc etc etc There is no shortage of racism controversies when it comes to this industry.
If someone goes out of their way to 'play on race' for the purposes of art, go ahead. Just be prepared to deal with individuals who are in no way entertained and amused by it. Freedom of expression/artistic freedom doesn't give you immunity from criticism.
There is nothing new or edgy about any of it. It's just really tedious.