pre analysis filter not working

I’m using the latest version of both Advanced Custom Fields plugin and the SEO plugin and I noticed the wpseo_pre_analysis_post_content filter isn’t working. The filter is already integrated into the ACF plugin but words are still not being picked up.

// set value
			if( !isset($field['value']) )
			{
				$field['value'] = apply_filters('acf/load_value', false, $post_id, $field);
				$field['value'] = apply_filters('acf/format_value', $field['value'], $post_id, $field);

				apply_filters( 'wpseo_pre_analysis_post_content', $field['value'] );
			}

http://wordpress.org/plugins/wordpress-seo/