Okay, so, I just did some digging.
Here's the website with the best information I could find using Baidu "image search" function (the article dated Janurary 2021):
Translation of the news article:
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"Shanghai, Jan. 4 (Yin Liqin He Baoxin) - On Jan. 4, a groundbreaking ceremony for the second phase of China Shipbuilding Changxing Shipbuilding Base, a major construction project listed by the National Development and Reform Commission, was held on Shanghai's Changxing Island.
This is another landmark project to promote the high-quality development of China's shipbuilding and offshore industry, and marks the full launch of the overall relocation project of Hudong-Zhonghua Shipbuilding (Group) Company Limited (Hudong-Zhonghua New Yard), a subsidiary of China Shipbuilding Group.
The new Hudong-Zhonghua site is located along the south coast of Changxing Island in Shanghai, with an area of 214.6 hectares and a total investment of RMB 18 billion. The first phase of the project, with a planned investment of RMB 8 billion, will consist of a R&D and design building, a hull joint workshop, a curved section welding workshop, an outfitting module centre, a painting workshop, a #1 indoor dock, a #2 open dock, a harbour pond and an outfitting quay, with a planned construction area of 460,000 square metres and a production capacity of six special vessels per year.
The new yard will organize production in accordance with the modern assembly shipbuilding mode, aiming at the world's advanced lean shipbuilding mode, starting from process optimization, making comprehensive use of advanced production concepts such as precision management, information integration, green manufacturing and intelligent manufacturing, establishing a scientific and efficient production management system, and realizing rational division of ship segments and general sections, streamlined and automated production, palletized management, and the integration of "hull, outfitting and coating". This will enable the rationalization of the division of ship segments and general sections, streamlining and automation of production, palletization of management, integration of "hull outfitting and coating", and large-scale loading of segments in the dock.
Hudong-Zhonghua said that the second phase of the Changxing Shipbuilding Base project will apply 5G+Internet dispatching, robot welding and Internet of Things operation to form a complete intelligent workshop system covering intelligent units, intelligent production lines and sensing systems, to achieve intelligent production process management and control in all aspects, and to build an intelligent and digital shipbuilding enterprise with streamlined personnel, efficient processes, energy saving and environmental protection, excellent quality and global leadership. (End)"
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To sum it up, the illustration above is just the depiction of how the relocated Hudong-Zhonghua Shipyard would look like once the relocation work to Changxing Island is completed in late 2023. The shipyards are relocated next to the current Jiangnan Shipyard.
There is no mentioning of any 3rd basin by both Jiangnan and Hudong-Zhonghua, though.