According to the information found on the Internet:
This is a park is called “鳳翔公園”(Fengxiang Park) and covers an area of about 2.5 hectares. In the early 2000s, due to the garbage protests, the city government had nowhere to dump the garbage. At that time, the city government temporarily placed the garbage at the current location of the park, and the result was a pile of about 5-FLOOR-HIGH garbage mountain.
After that, there was a slight cleanup in the mid-2010s, but the image of a landfill lingered, and the park was underused, gradually becoming a security blind spot.
News about this park (Liberty News, 2009)
Videos about a local councillor questioned the mayor in the parliament about why the park was abandoned (November 2024)
"There are a lot of storm-damaged trees piled up in Fengxiang Park, and 760,000 tons of garbage buried underground. Councillor Lee described the 9,000-square-foot area in the center of Fengshan as a cancer, and suggested that Mayor Chen seek a budget from the central government for remediation.
(By the way, you can see this Wayspot be at the corner of 0:58 in this video)
But the real reason for the park’s closure may be this
“If you are not careful, there is a possibility of explosion and fire… It is revealed that Fengxiang Park has been abandoned for many years and waste has piled up into a mountain. The councillor proposed to start the reconstruction of “high biogas”, but it has become a big risk.”
When the park was planning to start renovation three years ago, it was detected that there was a large amount of methane gas underground due to the previously discarded garbage. If the construction was started rashly, there would be a risk of explosion.
I think safety is the main reason for closing the park.