Nice, but not convincing. Actually people have used ultrasound to observe Gallstones prior to and their absence after a flush. There is evidence for that:
Savage, A. P., O'Brien, T. and Lamont, P. M. (1992), Case report. Adjuvant herbal treatment for gallstones. British Journal of Surgery, 79: 168. doi: 10.1002/bjs.1800790224
Ultrasound confirmed multiple gallstones, but after waiting months for a surgical option, the patient underwent a treatment with olive oil and lemon juice, resulting in the passage of four 2.5 cm by 1.25 cm stones and twenty pea-sized stones. Two years later symptoms returned, and ultrasound showed a single large gallstone; the patient chose to have this removed surgically.