I am not sure what you're talking about here, tbh: as for me, I am treating this culture with respect (my choice of smileys in the post you're responding to was not meant to 'mock' cultures, of course -- I actually find these nicknames astonishingly beautiful, -- only to accentuate how fitting and hilarious these names are in relation to Shoma, particularly 'Little One'). And I am sure Shoma and Shae-Lynn are doing the same. The costume is simply a stylization with some native American (Indian) features, where do you sense 'mockery' here? Or 'clever satire'? Or where exactly Shoma 'ineptly imitates indigenous cultures'? We did not even see the choreo yet, but I am sure there's no mockery there as well. Besides, I would not even focus too much on this 'ethno' side of music and choreo and call it 'imitation' -- 'symbolic representation' maybe, but definitely not an attempt to imitate, let alone 'mock', an indigenous culture.
If they wanted to create an 'imitation', of course they would work with indigenous artists and try to go deeper in this direction, but I doubt that's the point of this program. Hence the music choice.