Do you have the original book?
I've read The South Beach Diet, but it's been a while. I grabbed my copy to take a look, but don't see where Dr. Agatston breaks out the macronutrients for Phase 1.
You could take the back way into that information, though. He provides meal plans for each day. If you input those into the food tracking page and see how the macronutrients average out, that might answer your question. Since he provides recipes, you could create custom foods on that page.
It would be a time consuming, though... I think if you stick with the meal plans and his rules about foods to eliminate during Phase 1, you'd see how that averaged out in practical terms.