That’s not what it says. It has licensed technology to make a different version of Gitlab for the Chinese community.
What it does say:
so you can still use Gitlab CE on your own server, you are not forced to use Gitlab JH. If you currently use EE, then you would have to either move to CE or transition to JH. So there will be Gitlab.com and Gitlab.cn, obviously with Gitlab.cn running the JH version. Assuming Gitlab.com doesn’t get blocked from inside China, then it shouldn’t be an issue.