This seems very much like an ad for the NSNG site. And as far as I can tell, it's just keto with a dose of "don't feel bad if you have pie for xmas".
Note that NSNG adherents use the term ‘way of eating’ rather than diet
This usage precedes NSNG by decades. We used WoE in preference to "diet" in the 90s in keto forums like ASDLC.