It is closed to public, put it this way, go at your own risk. Not so much from that sort of thing but also that the place is so unmaintained, many of the structures are falling apart. Hence be careful where you step.
I am the someone... I do have a name.... and I provided the info based on what I saw when I visited a film set for a maggie q and fann wong movie and what the crew told me. Just a word of caution to prospective visitors, the structures look alright but some of them WILL collapse under weight. Well it's your call and your life.