Custom Firewall rules for NS

Hi guys, if we have a domain in Cloudflare with a particular subdomain with NS records pointing to a 3rd party nameserver, will Custom Firewall rules still work for the subdomain?
https://developers.cloudflare.com/waf/custom-rules/custom-firewall/create-dashboard

They won’t, as requests for any hostnames of that domain won’t go through the proxies.

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