Of course, and Hitler probably allowed you and I to be born in some way or another.
The point of the article is that the sound of golden-age Hollywood film scores, as we know them, would not have existed, because it's primary architects were refugees.
Just as the 1905 pogrom of Odessa caused heaps of Eastern European Jews to flee to America, with the same impact on the Great American Songbook, which probably wouldn't have existed otherwise. (Well, there'd have been Cole Porter.)
Of course, I wouldn't have been born had my grandmother, in the company of her little sister and their Mum, NOT got out of Odessa before it happened
MG