That’s right. Just casually filling in two NS records is basically a unilateral declaration that someone else will resolve this subdomain.
Ideally, you should add delegation in the next-level authoritative NS system to confirm that you really are resolving this subdomain yourself, so that it can propagate globally.
I haven’t had any issues in my tests. You can give it a try. Also, the ns API is compatible with A/AAAA/TXT/MX/CNAME records.
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I’m abroad right now, okay?
I’ll have to wait until the 6th.
(Our school is used as a college entrance exam testing site, so we get one more day off than other people, hahaha)
Very nice, it took effect almost instantly. Also, vps8’s bot check has now switched to CF Turnstile, which is much more convenient than the previous CAPTCHA. Thumbs up 
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Learning.