1. It is not a park because there is very little greenery. If you watch the video linked in the first article, at around 1:35 you can see what the drone shows you.
2. I did not cite an article for access=private. That is local knowledge. After around 2020 when this residential area became famous on social media so many people came here to take photos, the residents complained and the building management installed a security system where only residents can enter the compound with electronic cards.
3. I did not guess the names. The second link I linked was to a local property website which includes the layout for that compound. Because this is Hong Kong, businesses are supposed to provide both an English and Traditional Chinese service and that is where it comes from. The name "Sitting-Out Area" was not created by me. It was given by the property website. As for it being a recreation ground, look at the video in the first link as I have said in my first point. It shows you what the actual condition on the ground is like.

Finally, please don't assume that others are "guessing".