That only represents the data of Google Play. Considering China is one of the largest markets of UC, yet doesn't have access to Google Play, the actual number would be a lot more than that.
According to iResearch[1], it has 311m "monthly unique devices" in China in Feb 2019.
According to iResearch[1], it has 311m "monthly unique devices" in China in Feb 2019.
[1]. https://index.iresearch.com.cn/app/detail?id=12&Tid=73 (Chinese)