Multiple Custom Meta Ordering in WP_Query?

I have really been looking forward to sorting by multiple post metas on my custom post type and when I saw this post and I am using this array as my arguments but it won’t sort by both post metas?

Array
(
    [post_type] => listings
    [meta_query] => Array
        (
            [0] => Array
                (
                    [key] => car_sold
                    [compare] => EXISTS
                )

            [1] => Array
                (
                    [key] => make
                    [compare] => EXISTS
                )

        )

    [paged] => 1
    [posts_per_page] => 30
    [order] => ASC
    [suppress_filters] =>
    [orderby] => Array
        (
            [make] => ASC
            [car_sold] => DESC
        )

)

Does anyone see something not quite right with the arguments I maybe overlooked? Or am I misunderstanding the new query improvements?

Thanks.