https://news.gandi.net/en/2017/07/detailed-incident-report/
Notice the difference between the delegation and the zone itself:
;; bailiwick: ch.
;; count: 4
;; first seen: 2017-07-07 12:34:28 -0000
;; last seen: 2017-07-07 12:34:28 -0000
scrt.ch. IN NS ns1.dnshost.ga.
scrt.ch. IN NS ns2.dnshost.ga.
;; bailiwick: scrt.ch.
;; count: 3
;; first seen: 2017-07-07 12:34:28 -0000
;; last seen: 2017-07-07 12:34:28 -0000
scrt.ch. IN NS ns1.example.com.
scrt.ch. IN NS ns2.example.com.
Seen by DNSDB