The Rebbe explains that deep understanding in Chassidus—especially its intellectual approach—is unique to Chabad, not general to all Chassidic paths. Only one deeply immersed in Chassidus can assess whether it is "Kabbalah" or if the generation can receive it; others lack the basis to judge.
https://www.torahrecordings.com/rebbe/igroskodesh/015/010/5566