Yes, it's a joke! Erdogan is an idiot to think Israel would want to attack. Maybe Iran, but certainly not Turkey. Israel should have been entitled to invade Jordan or Egypt, but made peace with those countries. They're at war with Gaza, the Left Bank, Syria and Lebanon (not declared but same thing when constantly getting attacked by them). Israel will never target Turkey.
Erdogan dreams of bringing the Sultanate back with him as Sultan. It would stretch from Asia Minor to their ancestral homeland Turkmenistan.
Maybe they should invade Delaware, considering some of the bonehead moves that have come out of there lately.