I matters little if it has any islamic theological backing, what does matter however, is what individual jihadis and their supporters think and feel.

ISRAELI PUTS PORK ON DEAD TERRORIST’S BODY, DENYING HIM HIS VIRGINS
If burial in pigskin will deter suicide bombers, then it is incumbent on us to do this. “
October 12, 2015
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There’s a long history of people fighting Muslim Jihadis by wrapping their Jihadis in pigskin or shooting them with lard bullets. US soldiers did it not all that long ago in the Philippines. While the belief that pork on a corpse can stop someone from going to heaven is nonsense… so is the underlying belief that killing non-Muslims atones for all sins. And if it deters Muslims, it’s a plus. And if it doesn’t, it still shows them that people aren’t as helpless in the face of their racist violence as their governments often appear to be.