Apex domains cannot have CNAME records.
Question and response
Question
dig vdx.sh. NS
Answer
vdx.sh. 5 NS lucy.ns.cloudflare.com.
vdx.sh. 5 NS dean.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0