Whilst advertising never hurts an airline, and most are in need of at least a press release, I doubt Saudia will be desperate to get the message out on al levels.
Tickets for them are usually sold through independent travel agents (like those you find on the curry mile), and potential 'business' seats may have already been informed via emails. Also the main driver for this route is cargo, and as long as that keeps coming then the route should be reasonably safe.
Any extra exposure may well be just bonus material to them, but I don't expect much advertising of the Jeddah route.