Because China gets a lot of their styles from Japan.
They're basically imitating what Japan was in the early 2000's.
It does make sense from a cultural point of view too, since these younger generations are basically the first generations that didn't have to toil in factories and be all into politics.
The country is radically on the up too and has been for a long while, regardless of what people online are saying about them collapsing any moment now.
Their cultural progression is basically following what happened in the West and Japan 25 years ago.