Yes he did. he said ובתוכו ה יתברך the בתוך means in a guf (look it up) and ה יתברך means what it says . I will let non biased readers look it up and decide the obvious . OF COURSE this NEEDS explanation but the same explanation given to nefesh hachaim applies to the rebbes words.
The Rebbe says he was not aware of sources in chassidus for this exact concept. Obviously because nefesh hachaim is not a chassidic source. And even litvish don’t learn it much, so yes a shturem amongst the ignorant.