For China a data set like this is only usefull if it can be validated, which it seems from reading between the lines, they have/are doing.
The only use China has for this data set it to guage a competitors true capacity, VS there own capacity.
It is highly likely that this data set will not be used to access any individuals information in any way that could lead to a situation that then could be back tracked, and that the copy that China has is hermeticaly sealed off in some inner sanctum of the secret squirles.
Any posture that China takes will use many other sources of information beside this one.
And of course, it's Chinas posture that has some strategists concerned right now, which is compounded by what looks like a perfect job, done completly online that has left a dead end trail, and zero proof of anything.
So classic spy craft, with no possibility of a hollywood movie.