I attended a Catholic High School in Detroit in the 1960’s during the time of the muslim ‘troubles” in Lebanon. I had friends who were devout Chaldean Christians who had escaped Lebanon. The mudslime problems in Deetroit started later. I never heard about Henry Ford bringing mudslimes to the area and I have doubts about the veracity of that statement.
You are correct! Henry Ford died in 1947 long before Arabs from the Middle East starting coming to American in large numbers.