I don't know who the mechaber is, but doesn't sound right. I'm sorry.
R Yosef Albo has 3 Ikkarim, Rambam has 13.
To say you're not bichllal Yehudi for an inyan of Emunah that isn't even an Ikar is totally uncalled for, and just wrong!
I don't even see the issue at all if someone does not believe it, he flips the words around says הקבה גוזר והצדיק מבטל.. chazal say צדיק גוזר והקבה מקיים..two very different things ...whatever.. but always off putting when u see these seforim say "and anyone that does this and this, אינו בכלל יהודי" like what are you doing, if it's a rishon it's one thing but otherwise there are clear things that make or don't make u בכלל יהודי don't add on to what we have please, כלל ישראל is dealing with enough as it is.
Whoa! I'm not sure I even want to address this garbage, but what what I do find extremely ironic is after having gone through with you about your belief that anyone and everyone should learn Kabbalah, (AKA קליינע אותיות), but very weirdly you state with the most confidence about an open gemara - not a sefer Ikrim or other sifrei Kabalah you're so enthusiastic about- that it's non existent, and not only that, it was a distortion made by nearly all the sifrei Chassidus.
:מו״ק טז
אָמַר אֱלֹהֵי יִשְׂרָאֵל לִי דִבֶּר צוּר יִשְׂרָאֵל מוֹשֵׁל בָּאָדָם צַדִּיק מוֹשֵׁל יִרְאַת אֱלֹהִים״. מַאי קָאָמַר? אָמַר רַבִּי אֲבָהוּ, הָכִי קָאָמַר: אָמַר אֱלֹהֵי יִשְׂרָאֵל, לִי דִבֶּר צוּר יִשְׂרָאֵל, אֲנִי מוֹשֵׁל בָּאָדָם, מִי מוֹשֵׁל בִּי — צַדִּיק, שֶׁאֲנִי גּוֹזֵר גְּזֵרָה וּמְבַטְּלָהּ.
The Tiferes Shlomo is one of the most famous and most learned Sifrei Chassidus out there, but that's just another area where your ignorance and arrogance go hand in hand.