Leshem Yichud II

Question

Dear Rabbi, You mentioned before that there is a difference between believing in kaballah and following halacha according to kaballah. However, in the case of leshem yichud, the nodah beyehudah that you referred to seems to suggest something more. According to his teshuvah, there is something in kaballah, namely leshem yichud, that is patently false and is antithetical to the basics tenets of Judaism. I am curious if that means that certain parts of the kaballah can be false? (leaving aside the question of halacha) Thank you so much!!!