Even a soap with a cleansing value of 0 will clean. All soap will clean, but a cleansing number of 0 will not strip natural oils from your hair/skin. It's just misleading wording on SoapCalc's part.
That being said, some people do like coconut oil in their shampoo bars. Everyone's hair is so different; there's not really a one-size-fits-all solution. I would recommend making a batch with no coconut oil and one with a small amount, like up to 5%, and see which your hair prefers. I try most bars I make on my hair, just to see if I stumble upon something that works well for my hair type.