It is notable that they didn't mention manufacturing and only mentioned development and commercialization. I think it would be an IP theft disaster if a Chinese company were taught how to manufacture this ADC, and it would likely be manufactured at a place like Lonza and supplied to Huadong.
Notably, small molecules don't typically get deals like this in China since their chemical manufacturing industry just rips off the IP. I think antibodies and ADCs are much harder to faithfully copy and can garner deals like this.