Menachem, he was being “meyashev” why the mitteler could not sleep in a sukkah and why neo chabad doesn’t either. His answer is not brought down anywhere else, it’s the metztayer that you’re not mitztayer stuff, which the mitteler never said. The mitteler made those remarks, but he was not without a normative heter on top of his kabalistic intentions.
This is akin to rav meir shapiros answer as to why rebbes daven late; rebbes say kabalistic reasons, but, says rav Shapiro, they have a valid halachik heter underneath it, namely that s rebbe is oatur from tefilah as he is a toraso umnaso. Same thing here. The mitteler was patur because of the russian cold. He remarked that he couldn’t sleep with the ohr makif there as well, but that on its own is not a halachik heter.
It’s also just a remark. It’s not a teshuva. Chabad makes way too much out of remarks made by gedolim. Sometimes they’re meant kfff the cuff; you need to be a talmid to see this. It’s like when the rashash wrote that a gemara was a kasha on “those who say that there are gulgulim” – he wasn’t doubtful about it, it’s nust shigra dilishna.
Re, shalosh seudos – hayom yom is quoting the Rayatz, but the Rayatz did not write that sefer, as far as i know. Same thijg eith the Lubavitcher rebbe saying things beshem him – you can’t prove the legitimacy of a person by quoting him as a reliable source; מאן לימא לך דבר סמכא הוא