ns2.googledomains.com has no CNAME records.
Question and response
Question
dig ns2.googledomains.com. NS
Answer
The response has no answer records.
Authority
googledomains.com. 60 SOA ns5.googledomains.com. dns-admin.google.com. 879543655 900 900 1800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0