MM,
1. EVERYONE knew there was going to be a war. People were doing anything they could to escape. Furthermore, the letter was most likely written in 1940, which was after the war.
2. This letter was a letter. It doesn’t have anything to do with the FACT that visas were offered to him and his yeshivah.
You can revise history all you want if it makes you happy, it just doesn’t change the facts.