Again, that isn't supposed to be a TXT record. The script prints CNAME instead of TXT because you're supposed to be creating a CNAME record, not a TXT record. The script then creates a TXT record for ca84ec58-2c53-429d-b226-4fba20ff0a56.auth.acme-dns.io matching the validation token. Though it really isn't expected that you'd be using that acme-dns host for your production use.
acme-dns confused me for a bit at first--here's the topic I created a while back that got me some answers: