I think what the parent is saying is that the nameserver information coming from the registrar’s Whois may not be accurate in any way compared to what is actual

I think what the parent is saying is that the nameserver information coming from the registrar’s Whois may not be accurate in any way compared to what is actually in the DNS. The DNS (and, by extension, the authoritative nameservers for a domain) is, by definition, the most up-to-date source for the DNS. Edit: registrar’s whois