I think that's a good thing, but it's not something special. Here in my country many social media business account talk about bitcoin and it seems that many countries are more familiar with bitcoin. Although China has big number of population but bitcoin is currently used by many more people across the world. I think the effect that china can give to bitcoin is not significant.
it's going to be significant because by allowing people to invest in BTC, they might also allow people to mine BTC as well which we all know they previously were regulating and busting bitcoin mining farms. when they do allow them, more virgin coins will only be created in China which the government and the institutions based in China may even buy from these mining farms. they could dominate, corner and control the market