This is not surprising –
“New findings suggest that adolescent girls and boys might experience depression differently and that sex-specific treatments could be beneficial for adolescents.”
Depression is a very complicated thing. It rarely displays the same way for everyone, and things that help one person may have no affect at all on another. We know that. Why would we think there wouldn’t be significant differences between different genders?
Of course they should be different. Treatment should seek to find what works for the individual, and if gender plays some role in helping us find the right treatment for each person, great. It’s not the only thing, but anything is better than assuming everyone with depression acts the same and responds to the same treatment.
That is obviously not true.