I think you may have missed my point. I am not saying smarter people figured out a way to escape. The point I made was that people of means were more likely to escape. And people of means have a higher intelligence on average which is the discussion at hand. Even during the Nazi rule, Germany allowed emigration by Jews, but most countries would not take them. One of the ways to get out was by guarantee which was essentially a payment. Running up to the takeover of Poland many Jews escaped to the Soviet Union. If you had no money you would not have the means to pack up and move your family. Again, as I posted earlier, if even 2 in 10 rich men were able to escape that is double the average rate and would put upward pressure on average IQ.
Againg, I suggest you read The Hare with Amber Eyes, among other firsthand accounts. People of means were less likely than to leave before it was too late. If they were among the minority who owned factories or other thriving businesses, they perceived that they had a lot to lose by leaving it all behind and thought that they could whether whatever was coming as they had past pogroms, etc. It may seem counter intuitive to you, but that’s they way it was. You are right that people in Germany had more chance of leaving in the 1930s, had they decided to do so.