The waterpark, scheduled to open on June 26, 2021, is progressing quickly with rides and the wave pool testing:
Sunac is planning to open the adjacent theme park by the end of 2022 and just this week work resumed on the first ride - a ferris wheel:
I say worked resumed because back in 2018 the foundation of the ferris wheel had already been built, as seen here: https://www.themeparx.com/hangzhou-bay-sunac-tourism-city/?p=13868#post13868
Lastly, the indoor snow park which was not part of the Six Flags plans but is part of Sunac's new plans is scheduled to begin construction in September 2021.
Sources: https://v.douyin.com/JnAStYf/ and https://v.douyin.com/JnAhfqD/ and https://v.douyin.com/JnAmcJd/ and https://v.douyin.com/JWFQkdx/ and https://v.douyin.com/JvJJ77n/ and https://v.douyin.com/JvJFo2v/ and https://mp.weixin.qq.com/s/AbjH5wTu8TE5RJ-d2Hummg