it would be very odd in England or America to still pronounce it the German way.
But he's old enough to remember Brian Epstein whose name people did flip-flop over pronouncing steen or stein. So, it's not very odd.
From that NYT article:
"What about steen and stine ? Is there any rhyme or reason to the chosen pronunciation? Everyone named Stein, and Stein alone, pronounces the name stine . Stein is a stein is a stein, as Gertrude used to say. Yet Andrew Stein, Borough President of Manhattan, and soon to be a candidate for Congress from the ''silk-stocking district,'' has an industrialist father named Jerry Finkles tein, who pronounces the last syllable steen . When son Andrew shortened the name, the pronunciation automatically shifted.
Here are a few stines : John Steinbeck, Albert Einstein, Gloria Steinem, Mayor Dianne Feinstein; the ''eye'' pronunciation of the ei can also be heard in the names of Dwight Eisenhower, Carl Reiner, Caspar Weinberger and Barbra (only two a 's) Streisand.
Now here are a few steens : Leonard Bernstein, Carl Bernstein, Robert Brustein. Gambler Nicky Arnstein married Fanny Brice, played by Barbra Streisand, in a confusing ee-eye-o."