Library Browser Object methods "getSortedLibraryNames" not accessible in 2016b (was in 2012b)

In MATLAB 2012b, it was possible to get the visible libraries in the library browser like below:

 GUI.cm = DAStudio.CustomizationManager;
 GUI.lbBrowserLibraries=GUI.cm.LibraryBrowserCustomizer.getLB;
 % get Visible Libraries in the simulink Browser 
 visibleLibraries = GUI.lbBrowserLibraries.getSortedLibraryNames;

However, in MATLAB 2016b, it is not possible to get the library browser object via:

 GUI.lbBrowserLibraries=GUI.cm.LibraryBrowserCustomizer.getLB;

and then call the given methods.

I know it is possible to access a library browser window object in 2016b with:

 GUI.lbBrowserLibraries = LibraryBrowser.LibraryBrowser2

But, it is not what I need. It only contains the window management methods.

Is there an equivalent in MATLAB 2016b?

Note: I also know that it is possible to get all visible and non visible libraries with:

LibraryBrowser.internal.findLibraryInfo

However, it looks like this function regenerate all paths and looks in every folders and subfolder in order to find the libraries. This can take up to 5 minutes because I have a bunch of libraries in given directory. On the opposite,

 visibleLibraries = GUI.lbBrowserLibraries.getSortedLibraryNames

only took milliseconds to get the libraries from the GUI.