Did you also notice this portion of the article?
There had been no complaints about the meetings, which had been rotating among members' homes before the officer wrote the letter and ordered the group to "terminate all religious meetings regardless of their size, nature or frequency," because he noticed signs about the meetings.
IOW, this isn't even in response to a complaint. The local government nazis are making an issue out of it for whatever reasons they may have, one of which seems to be that they advertised the meetings. I don't think we are talking about a huge garish neon sign or anything of that nature. More likely, we are talking about a notice pinned on a bulletin board at your local market or, possibly, a political campaign sized lawn sign which moves with each rotating meeting so the members can easily find the place.
Or less, if some rode together...