Full translated quote:
"The Flash failed, apart from all the others reason (Ezra Miller, superhero fatigue) because it wasn't a movie that appealed to the 4-quadrants. It failed at that.

When you spend $200 million making a movie, Warner wants to bring even your grandmother to the theaters. And I found out in private conversations that a lot of people just don't care about The Flash as a character. Particularly the two female quadrants. All that is wind going against the movie that I learned about."