"Return to Castle Wolfenstein" was the only game of the Wolfenstein series where you don't play as William "B.J." Blazkowicz.

The statement is false because in the game "Wolfenstein: Youngblood," released in 2019, players do not control William "BJ" Blazkowicz exclusively. Instead, the game introduces his twin daughters, Jess and Soph Blazkowicz, as playable characters. "Youngblood" takes place in an alternate 1980s Paris, and the story revolves around the search for their missing father while combating the forces of Nazi Germany. Hence, "Return to Castle Wolfenstein" is not the only game in the Wolfenstein series where players do not control William BJ Blazkowicz.