The article doesn't say it's happening. This is from another source:

Mao Xiangdong, vice-president of the Shanghai Institute of Technology and a member of the standing committee of the municipal people’s congress, proposed the idea during Shanghai’s ongoing legislative sessions, according to a post by China Development News, a newspaper under the National Development and Reform Commission.

It is not clear when the post was put online but it was removed on Friday morning

Source: https://www.scmp.com/news/china/politics/article/3295169/unplug-great-firewall-boost-chinas-competitiveness-shanghai-lawmaker-says