Ling Ling is an actual Chinese name that is still in use. Hell it's even the name of a place in China. So no it's not racist. It's only racist if you make it racist. Which only says something about you.
Ah I found out it was because it doesn't actually change the world skybox but an actual circle skybox that covers the area you build in. I was having issues because the skybox I wanted to use was 6 sided and not cubemap. I could probably still use the one I wanted but I've only just created my first world so I'm still figuring things out. This helps a lot though if only to just teach me how to do stuff like this.