I have not really read the books of Kabbalist Rabbi Moshe Cordevero (Ramak) but according to a footnote of Rabbi Aryeh Kaplan in Handbook of Jewish Thought, Rabbi Moshe Cordevero agrees with the Rambam's definition of G-d, and interprets the ten Sephirot of Kabbala in a way that does not contradict Rambam's principles. See chapter 2 section 11 footnotes 12 and 13.
The laws against Lashon Hara as well as our general respect for Torah scholars, requires us to look for every possible way to judge our great Torah scholars as having acted properly and believed the proper beliefs.