It might be intentional. I noticed the accent too and it really left the impression that china is a technological leader now and might not need to adapt to the west as much anymore.
Xiaomi products are also rarely widely available in the west as it is. So I’m not sure the west is their primary market at this point.
European fake CEOs are going out of fashion bit, by bit, but the demand for caucasian actors in China is still unrelenting.
Just go to AliExpress, and imagine just how mind boggling many models did it took to make all these photoshoots.