One could add Paul Frankenburger aka Ben-Haim (1897-1984) and Joseph Gruenthal aka Yosef Tal (1910-2008) who both left for Palestine with the ascendancy of the nazis in 1933.
Indeed. I did emphasise that my list was only selective and I will doubtless have missed many more.
What I did do however was to look at the generations born before 1888 and (excluding those like Max Reger who died long before the Nazis came to power) there are composers like:
Felix Woyrsch (1860-1944)
Richard Strauss (1864-1949)
Georg Schumann (1866-1952)
Hermann Bischoff (1868-1936)
Max von Schillings (1868-1933)
Hans Pfitzner (1869-1949)
Paul Buttner (1870-1943)
Hermann Wetzler (1870-1943) (emigrated)
Paul Graener (1872-1944)
Richard Wetz (1875-1935)
Ernst Boehe (1880-1938)
Hermann Zilcher (1881-1948)
Walter Braunfels (1882-1954)
Wilhelm Furtwangler (1886-1954)
Heinrich Kaminski (1886-1946)
Hienz Tiessen (1887-1971)
Max Trapp (1887-1971)
Most of these composers were dead by the end of the war or fairly shortly afterwards. Only Tiessen and Trapp survived beyond 1954. But Tiessen, whose music was suppressed by the National Socialist regime, virtually ceased composition after 1945, while Trapp, whose music enjoyed official approval before 1945, found that he was largely shunned thereafter.
A composer does not, of course, need to be alive for his music to be "popular" or indeed to be revived. The music of Braunfels is currently enjoying a well-deserved renaissance. But in the unique circumstances of post-war Germany the reaction against many of those composers whose music was now regarded as "out of date" was particularly damaging.