First of all, I don't know why I feel like you're trying to promote the link you posted above because I don't see a piece of solid information that proves China was the biggest user of digital currency, and what I saw in the link is the People's Bank of China worried about the security of their digital Yuan.
Meanwhile, if China was once the country that has the highest miners that don't mean they also have the highest digital currency user, and for the record, they only like to benefit from crypto financial freedom potential.