The app cannot function as you'd expect a screen saver to do: it won't start running after a period of inactivity. That is outside the scope of functionality available to apps.
As such, yeah the name is a little misleading.
As such, yeah the name is a little misleading.
Off topic: As a child I loved to look at screen savers that I manually started for hours wondering how they work and how long it took to build them...
My point is that XScreenSaver is a proper name, and by now should be considered to have earned its name.
iOS does not support screensavers. The app's name is misleading. It seems pretty cut and dry to me.