Cemetery of Saydnaya prison Victims? Unlikely

Amnesty International published a report about killings in Saydnaya prison (Syria) last week, and this week in answer to the question where the bodies went, a handout photo is produced:

Original caption: "A handout image by Amnesty International shows the military-run Saydnaya prison, one of Syria's largest detention centres located 30 kilometres (18 miles) north of Damascus, in two distinct satellite pictures, one taken on March 3, 2010 (L) and the other of the same taken on September 18, 2016. AFP/AFP/Handout "

This however seems to show a moderate-sized civilian cemetery. Note the co-ordinates given  33.3927°, 36.3685°.... which turns out to be a small village cemetery for the settlement Kherbet Al-Ward, some 33 km south of the Saydnaya prison, on the other side of Damascus. The satellite photos of the prison itself (33°39'54.99"N  36°19'43.22"E) do not seem to show any mass grave sites.