Removing "Review" metadata

As suggested in http://ww.wp.xz.cn/support/topic/adding-reviews-to-events I’ve added the WP Customer reviews to events and locations with the proposed workaround.

However, now that I’m looking to remove them, I’ll need a similar workaround to disable the plugin from events and locations.

Can this be achieved by altering the “Disable Plugin for all Existing Posts” code [below] and replacing ‘post’ with ‘event’ and then pressing the respective button in the admin interface?

elseif ($this->p->Submit == 'Disable Plugin for all Existing Posts') {

            global $wpdb;

            $wpdb->query( "DELETE $wpdb->postmeta FROM $wpdb->postmeta

                            LEFT JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->postmeta.post_id 

                            WHERE $wpdb->posts.post_type = 'post' AND $wpdb->postmeta.meta_key = 'wpcr_enable' " );

        }

Any thoughts on whether this is likely to work / screw up the site?

https://ww.wp.xz.cn/plugins/events-manager/