I suppose you followed my post, I know the heavily limitations Deepin has for gaming because of its outdated drivers, non-curated drivers from official page are the last option to use in every Linux distro, but here they are the only option (for example, if you install .deb nvidia drivers from ppa, they'll work, but without nvidia-settings panel) on Deepin.
I can live, for now, with that, using Steam as a Flatpak. Games through Itch app and Lutris work for me (I do not use Deepin's store to install non Deepin things because most of them come outdated, and I prefer flatpaks as they don't touch the system at the level that main apps do).
If you want new drivers and Deepin desktop, try Manjaro Deepin, but, as a community managed Manjaro spin, and like Arch based distros, it tends to break sometimes with its constantly updates.

Edited by habios at 2019-1-18 04:48

So as for Deepin 15.9, closed source drivers have not been updated yet.

No, and I do not recommend you to try to install official ones for now. The only thing to do if you want last drivers for now is to move to an Arch based Deepin distro, Arch Deepin, Arco Deepin, Antergos Deepin, Manjaro Deepin.

Yeah, I have to agree as well. I was getting annoyed with the old  Nvidia drives. So, I ended up switching to Manjaro Deepin. I get the latest drivers that I need for my gaming. So, far I have been really happy with it. Oscararg make a good point that the constant update package can break your system.  You can force lock your current package once you find everything works the way you want.