I understand that it's possible in theory to travel from Israel to, say, Kuwait, but many countries in the Middle East refuse to accept either Israeli passports or passports containing Israeli visas. In fact, to quote from the International Air Transport Association, "Passengers intending to proceed from Israel to Arab countries other than Egypt, Jordan, or the United Arab Emirates should see to it that their passport does not contain Israeli visa or stamps since no passenger is allowed to enter other Arab countries with such passports." Considering the chances are much higher of the producers wanting to visit Arab countries which include, among others, Kuwait, Oman, Tunisia, and Morocco (all seen on TAR US -- with Oman also appearing on TAR Asia -- and plausible for this or a future season of TAR Australia) than to limit their entire Middle East travel severely for both this and the other versions, it's extremely, extremely unlikely the Israel spoilers are true.
The insurance costs are significantly higher for Australians due to the instability in Gaza and the West Bank, and in the surrounding nations. While Seven is indeed throwing bucketloads of money at the show, they're not going to be splurging on travel for dozens of cast and crew to visit a nation like Israel, regardless of how safe it is in actuality.
My understanding, having spoken to a source at ActiveTV, is that the photo is a fake, and that the TAR Australia contestants were "in North America" at the time it was taken.
Everybody connected with the show -- contestants, crew, greeters, task operators, even locals who assist the teams with directions -- are forced to sign a non-disclosure agreement when they become involved, so there's no way all that information could have gotten out about a potential leg in the country when there's a huge legal cloud over anybody who dares to break it. (In fact, one of the greeters from this season of TAR Asia had to hold off on publishing an article about her experience until after the episode had aired.)
Don't get me wrong, I hope Israel does get visited one day, but right now? No.