Amendment to private event categories (TEC)

// Remove this line
add_filter( 'parse_tribe_event_query', 'hide_my_private_category', 999 );

// Replace it with this
add_action('init', 'whenLoggedOut');

// And also add this
function whenLoggedOut() {
    $current_user = wp_get_current_user();
    if ($current_user->ID === 0)
        add_filter('parse_tribe_event_query', 'hide_my_private_category', 999);
}