If you go through the rules, especially in the harassment section, it is harped on pretty hard "If it's against the rules to post it on the Flight Rising website, you shouldn't be posting links on our site to it either."

By that definition, having a NSFW section of your discord applies. I don't think they'd ban people in this case though. I suspect they'd do what they did to that one accent previewer's links to remove all the light discord links they can. Because the people posting NSFW there aren't necessarily the people linking it on site.