For what it's worth, pool.ntp.org has 5 DNS authorities listed on three continents. So I think the DNS servers themselves are pretty redundant, although I can't comment on the architecture behind it that's creating the DNS records to serve.

$ dig pool.ntp.org any

;; AUTHORITY SECTION:
pool.ntp.org.           54148   IN      NS      aventura.bhms-groep.nl.
pool.ntp.org.           54148   IN      NS      ns1.us.bitnames.com.
pool.ntp.org.           54148   IN      NS      ns1.mailworx.net.
pool.ntp.org.           54148   IN      NS      usenet.net.nz.
pool.ntp.org.           54148   IN      NS      zbasel.fortytwo.ch.

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