The designation "Sword Saint's Secret Realm" was coined later by members of the Seven Jue Sect themselves; it was not named by the Sword Saint Feng Qingyang himself...
In short, the Sword Saint's Secret Realm was an "Outer-World Secret Realm" that Feng Qingyang had entered years ago, wherein he obtained a great fortuitous encounter.
Everything inside had nothing to do with Feng Qingyang, nor was it something he had the ability to control.
Chapter 2388