I was following the thread on SkyscraperCity and there was never any real doubt that It was a 2019 there either... (Edit: Yes I’ve just realised that when you said SSC you meant Skyscraper City )In the interview for one of the polish newspapers Marek Goczał, owner of the EL said that due to low attendance this year new area might be postponed and might be opened in 2021. And that is most accurate information we have at the moment. [I'll update the source once I find it]
To be completely honest regarding Zadra, we on polish SSC Community we had almost certain information it would be ready still in 2019, although all foreign websites could not believe and stuck to 2020.
Thanks for the source r.e Aqualantis