nerdcow.co.uk robots.txt parsing

Nerdcow.co.uk has robots.txt file. Http response code is 200.
Robots size is very small. It is about 15 kb and 4 rows.

nerdcow.co.uk has sitemap file https://nerdcow.co.uk/sitemap_index.xml. Host directive is not presented for domain nerdcow.co.uk in robots.txt file.

Array
(
    [*] => Array
        (
            [disallow] => Array
                (
                    [0] => /wp-admin/
                )

            [allow] => Array
                (
                    [0] => /wp-admin/admin-ajax.php
                )

            [sitemap] => Array
                (
                    [0] => https://nerdcow.co.uk/sitemap_index.xml
                )

        )

)

User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php

Sitemap: https://nerdcow.co.uk/sitemap_index.xml

код 200 http://nerdcow.co.uk/robots.txt