Sorry, what I was trying to say is that what I took from the title and article is that is that the
relative to other cleaning products baking soda and acv are not good at cleaning (natural or "kinky") hair (I think she's a type 4?). I think she put in the natural -- i.e. kinky -- because she didn't try this experiment on other hair types (which she does do from time to time using her husband's hair -- someone correct me if I'm wrong, I believe he's white.)
That being said, I don't think she's trying to say that baking soda and acv are not safe or damaging to use on hair period...just that given the experiment using a particular hair type it isn't "cleaning" it as you might have previously thought it was.
I think based on her writing style she prefers to just show the results of her experiments and then let the readers decide what works and doesn't work for them, while at the same time leaving them armed with the knowledge of why it it has been working or not working.
In this case, you could possibly say that your hair benefits from having a layer of oil on it and thus because the acv rinses spread the oil on the hair instead of taking it removing it completely, you know it work, instead of just saying it works just because...
Not sure if I'm making any sense...