I can't see what you're doing wrong. Perhaps its an issue with the version of the Moove theme you're using in relation to the theme settings and how they are fetched - so not using the correct theme_config instance you're passing in with '$theme'.
$THEME->hidefromselector - Is there to hide a theme, such as a 'parent' when you want only a child theme to be selected. Thus in the past you could select 'Clean' but not 'Bootstrapbase' themes.
$THEME->hidefromselector - Is there to hide a theme, such as a 'parent' when you want only a child theme to be selected. Thus in the past you could select 'Clean' but not 'Bootstrapbase' themes.