I have heard this also and my opinion is that this method is a waste of time and effort. Along with the "olive oil" method and seven dust.
I have a friend that got mites. I went to his place and used the products I always use and BAM no more mites! He lets people bring their animals into his room all the time so guess what he gets mites again and I tell him do what I did last time and you will get rid of them. I don't know if he just plain doesn't believe me (even though it worked before) or if he doesn't want to spend the money. All I know is I won't be back to his place until the mites are gone.
If you buy the proper products and use them correctly you will not have issues with mites.