The very fact that Israel exists as a term for a nomadic group of people in the Mernaptah stele makes your point moot. It clearly was not a term used just for the Northern Kingdom of Israel, which did not exist in 1207 BCE. The Biblical text is not nonsense but is clearly rooted in real historical events, even if the depictions of those events may not be wholly accurate.
The very fact that Israel exists as a term for a nomadic group of people in the Mernaptah stele makes your point moot. It clearly was not a term used just for the Northern Kingdom of Israel, which did not exist in 1207 BCE. The Biblical text is not nonsense but is clearly rooted in real historical events, even if the depictions of those events may not be wholly accurate.