<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

function ee_seo_xml_sitemap_no_event_type_single($url, $type, $term) {
    if (! isset($term->taxonomy)) {
        return $url;
    }
    if ($term->taxonomy == 'espresso_event_type') {
        $url = '';
    }
    return $url;
}
add_filter(
    'wpseo_sitemap_entry',
    'ee_seo_xml_sitemap_no_event_type_single',
    10,
    3
);