Apex domains cannot have CNAME records.
Question and response
Question
dig sushiboy.org. NS
Answer
sushiboy.org. 5 NS ns-1654.awsdns-14.co.uk.
sushiboy.org. 5 NS ns-975.awsdns-57.net.
sushiboy.org. 5 NS ns-0.awsdns-00.com.
sushiboy.org. 5 NS ns-628.awsdns-14.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0