The article speaks of the patient’s bone-marrow stem cells being transferred to other parts of the body, so they must be speaking of adult stem cells. Besides, given that the word “embryonic” was not included in bold and all-caps, it was obvious that these were adult stem cells. Also, given that this stem-cells treatment actually works, it must have been adult stem cells, since embryonic stem cells have never been found to cure anything despite the gazillions of public dollars spent on such research.
As I suspected — for all the reasons you give.