We discussed those green skyscrapers in university environment class, and as far as I know they didn't work that well. It was hard to keep the plants alive and when they did grow, they became a breeding ground for pest insects that got into the units where people were living. It's very much prioritizing looking green over being green.
IMO it's better to just have efficient but visually boring skyscrapers, and then have dedicated green space around clusters of density (which is what China is mostly doing nowadays). Separating housing and green space make both more effective, easier to manage, and more resiliant.
Also, in case you're wondering, most Western environment profs are very impressed by what China has done, at least in the university I went to.