I was just flipping through the home page of the Yeshiva World, and I saw the article. It makes it clear that this custom is a valid custom and there is a basis for it. Hence, I don’t think that it entails loshon hora.
I hear your concern, but I think there is a greater concern that if someone reads your post and hadn’t seen the original article, your post would lead them to think negatively of the Chassidim. Actually, that is what happened to me when I read your post. Boruch Hashem, I just “happened” to read the article , so it gave me an entirely different perspective.
On the other hand, the second post in this thread is definitely motzi shem ra and completely uncalled-for.