wp_query comment and meta query

The inline documentation of WP_Query has this:

Filter results by comment count. Provide an integer to match comment count exactly. Provide an array with integer ‘value’ and ‘compare’ operator (‘=’, ‘!=’, ‘>’, ‘>=’, ‘<‘, ‘<=’ ) to compare against comment_count in a specific way.

So there should only be one array, not 2 like with a meta query:

'comment_count' => array(
    'value'   => 10,
    'compare' => '>=',
),