Well, there's no standard definition of "low carb" so I suppose if someone ate 125g of carbs daily (which is realistic in phase 1) instead of the DRI of 130g, someone might consider it a "low carb" menu. But usually that is not what people mean when they say "low carb." Usually they're talking about diets that are strictly limit carbs, which is not what SBD does. For example, the American Academy of Family Physicians defines a low-carb diet as one that restricts daily carbs to between 20 and 60g: http://www.aafp.org/afp/2006/0601/p1942.html
SBD, even in phase 1, is far above that. So calling it "low carb" might be confusing to people who are thinking of some other meaning.
Here's a sample of a partial phase 1 daily menu, with carb counts:
2 servings of pinto beans for 45g of carbs
2 cups of nonfat milk for 25g of carbs
1 cup of chopped onions for 10g of carbs
1 cup of tomatoes for 8g of carbs
1/2 cup of sugar snap peas for 6g of carbs
1/2 cup of red bell peppers for 5g of carbs
2 tablespoons of natural peanut butter for 6g of carbs
1 tablespoon of agave nectar (for sweetening), 16g of carbs
Not counting any carbs that might be added from cheese or other protein foods, condiments, etc. this is right at 130g of carbs. It's possible for people to eat fewer carbs, and some people mistakenly do (by skipping the recommended legumes and dairy, not eating enough vegetables, etc.) But if you follow the recommendations given in the meal-planning template and FAQ, you'd probably be eating a pretty good amount of carbs, quite a bit more than on the diets that are billed as low-carb.
The reason I am taking the trouble to point this out is that people may see "low carb" and assume SBD is one of the high-protein, low-carb diets that have been popular in recent years (like Atkins) - which it's not.