You are correct. This story just came out a few months ago:
In a recent video interview, one Egyptian scholar exposed the high school curriculum coming from Al-Azhar university, the most reputable of all Islamic schools, showing that it condoned cannibalizing non-Muslims:
“We allowed the eating of the flesh of dead humans… under necessary conditions. It [dead human flesh] must not be cooked or grilled to avoid Haram (wrongdoing) …and he can kill a murtadd (apostate) and eat him”
...
Al-Azhar finds their support for cannibalism in Islamic authority. According to Al-Shafie, who is considered to be the founder of Islamic jurisprudence:
“One may eat the flesh of a human body. It is not allowed to kill a Muslim nor a free non-Muslim under Muslim rule (because he is useful for the society), nor a prisoner because he belongs to other Muslims. But you may kill an enemy fighter or an adulterer and eat his body (716 in volume 1, Al-Kortoby)”
http://shoebat.com/2013/01/28/islam-and-cannibalism/
So, according to this Sharia interpretation, this cannibalism is fine because the man was an enemy fighter.
You wouldn’t expect a hungry guy to eat that ham and cheese
on rye sitting in that zip-lok bag next to that dead body, would
you?