As we’ve seen in the past, anime censorship can be a very difficult thing to do subtly.
As you’d expect, Love Live! is heavy on musical scenes, and idol choreography involves a lot of outstretched hands, which help promote a feeling of oneness with the audience.
So once again, you can blame the Nazis for causing problems for modern-day Japanese artists and visual designers.
Unfortunately, Japanese pop idols aren’t the first group to show enthusiasm for posing with a raised arm. German law expressly forbids the display of Nazi symbols such as the swastika, and the Love Live! choreography seems like, at worst, a gray area.