Netlify site fails randomly and users are unable to access it

I ran the command below as seen on this support forum: [Support Guide] How to detect and fix inactive Netlify DNS zones

dig tagafrica.com.ng NS +trace | tail -n 6

and this was the response below:

tagafrica.com.ng.	3600	IN	NS	dns1.p07.nsone.net.
tagafrica.com.ng.	3600	IN	NS	dns2.p07.nsone.net.
tagafrica.com.ng.	3600	IN	NS	dns3.p07.nsone.net.
tagafrica.com.ng.	3600	IN	NS	dns4.p07.nsone.net.
;; Received 134 bytes from 198.51.44.7#53(dns1.p07.nsone.net) in 171 ms

It looks like the name server on the “Received” line is the same as the name server tied to the production domain on Netlify and not the name server of the domain registar.

Does this still mean that the Netlify DNS zone is inactive?