App save space useless?

HI.

I find in the App secure file manager the notification that,

This app is useless if you have a rooted device “

At the explanation why we fond >

When an file is hidden, the file is moved from the “shared storage” to the “app-specific storage”. When an file is unhidden, the file is moved from the “app-specific storage” to the “shared storage”.

In case of rooted device, all applications can see the “app-specific storage”.

So, the app save space is useless for the same reason ?