While I wouldn't rule out that this is true, it's difficult to trust numbers like that in China since people are so afraid to voice their true opinion. When I lived in China I learned that it was a basic rule of society that you do not express opinions about the government with anyone except for your closest friends, and even then it is extremely rare. It's no surprise that this is the case given historical events such as the hundred flowers: https://en.wikipedia.org/wiki/Hundred_Flowers_Campaign