Yes, that "82%" figure is so handwavy as to be meaningless. In addition to your questions, I have more: how was this figure arrived at? Where are the studies? How were they conducted? Etc.
Any single study needs to be treated with extreme caution even if it was well-conducted. In this case, we don't even know if a study was conducted and, if it was, whether or not it was of high enough quality to matter.
Any single study needs to be treated with extreme caution even if it was well-conducted. In this case, we don't even know if a study was conducted and, if it was, whether or not it was of high enough quality to matter.