Models may be of use in selecting drugs for actual trials. They are not the same as actual trials.
From the study:
They “used an established animal model of endometriosis that produces vaginal hyperalgesia, a surrogate marker for endometriosis-related pain. In this model, uterine pieces are autotransplanted onto mesenteric abdominal arteries. The uterine transplants develop over a period of weeks into cyst-like structures with characteristics similar to lesions in women with endometriosis.”
This same model has worked for many other endometriosis studies on therapies for humans.