Why the 'date_query' is not working in 'pre_get_posts' hook?

I need to output popular posts in a blog using several params:

• Not older than one week;
• Rating is over than 250;
• Order by date

Here is my code:

function evanre_custom_order_query( $query ) {

  if ( is_admin() || ! $query-is_main_query() ) {
    return;
  }

  $query_var_show = get_query_var( 'show' );

  if ( empty( $query_var_show ) ) {
    return;
  }

  if ( 'popular' === $query_var_show ) {
    $query-set( 'orderby', 'date' );
    $query-set( 'meta_query', array(
      array(
        'key'     = 'blt_upvotes',
        'value'   = 250,
        'compare' = '=',
        'type'    = 'NUMERIC',
      ),
    ) );
    $query-set( 'date_query ', array(
      array(
        'after' = '1 week ago'
      )
    ) );
  }

}

add_action( 'pre_get_posts', 'evanre_custom_order_query' );

My custom query_var is registered and working. Ordering by date works, meta_query works too. date_query is completely ignored. What am I missing?