I'm sorry to hear that you are having a hard time raw vegan :(. I didn't check out that website but I wonder if they are using the oriental health approach. They feel that cold foods are too yin and that this throws off the body's balance. It is really interesting if you ever feel like learning the relationship between yin and yang in the body (maybe you already have?). Here is an excerpt from an oriental medicine site I found:
Cold is a Yin pathogenic factor. If overly predominant, coldness can injure the Yang as Yang is hot and moving in nature, therefore, too much coldness can slow the Yang energy in the body down.
Coldness can be generated from an external influence, such as exposure to excessively cold conditions, or from an internal influence such as eating or drinking too many cold things. Conversely, an excessive amount of Cold can accumulate from a deficient amount of Yang in the body. In other words, there is not enough warmth being generated by the body’s Yang energy. This leads to a “hypometabolic state” and there is not enough warmth to equalize the cold, and coldness predominates.
Because the nature of coldness is slowing down, too much coldness can create contraction and later stagnancy. This stagnancy will effect blood and energy flow, which will in turn create more serious disease. This disruption in flow will initially cause actual feelings of coldness in the body and may cause a constrictive cramping type pain. Cold diseases are insidious, unlike diseases created by wind.
Still, you have to find what is right for you. My boyfriend's father was on the Macrobiotics diet for 20+ years (the diet is supposed to be a perfect balance of yin/yang). He strictly only ate meals from this cookbook (he just let me borrow it) every day for long before my boyfriend was born. 10 years ago, he got ulcerative colitis and has suffered since. He has been to many holistic and oriental doctors and many were upset they couldn't do anything to help him. Now, he even eats meat after being strictly vegetarian for so long (only extremely well done) and he has taken to Western Medicine (steroids). He feels like he wasted a large part of his life trying be healthy for nothing. I wonder if maybe I can convince him to try and cleanse, but I don't know if a Bowel Cleanse would just make things worse for someone with ulcerative colitis.
Sorry if this isn't really related-just thought it would be an interesting story for those who are trying to find their own path.