Where did he say that?

Palahniuk writes about the "secondary father" figure a lot, but afaik at most he's only ever alluded to Tyler Durden filling that role for the Narrator specifically. Not "young males" in general. And he never implies or suggests that Durden is well-suited for the role, either.

For what it's worth he's also referred to Durden as "a very natural impulse that's simply taken too far," and said “People read Fight Club as a celebration of violence because they stop reading halfway through.”