Apex domains cannot have CNAME records.
Question and response
Question
dig redirect.pizza. NS
Answer
redirect.pizza. 5 NS nscloud1.redirect.pizza.
redirect.pizza. 5 NS nscloud2.redirect.pizza.
Authority
The response has no authority records.
Additional
nscloud1.redirect.pizza. 5 A 192.174.68.100
nscloud2.redirect.pizza. 5 A 176.97.158.100
nscloud1.redirect.pizza. 5 AAAA 2001:67c:1bc:0:0:0:0:100
nscloud2.redirect.pizza. 5 AAAA 2001:67c:10b8:0:0:0:0:100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0