That article you link to doesn't seem to contain any reliable info to support that conclusion.

The head of the GCC is now saying it was organized crime, though until solid evidence is made public, that's just as much of a useless sound-bite as the accusations the UAE cops have made against Israel. And apparently the Syrians have now detained a Hamas figure named Mohammed Nasser, and some other Hamas members, in connection with the killing.

Still waiting on information that will enable us to actually draw defensible conclusions. None has yet surfaced.