No he is saying that many smart devices ignore your DNS (pi-hole) as they hardcoded their DNS address to 8.8.8.8. So it is important to have an additional layer to block at the firewall.
google for the things you want to host and append “termux” to it, e.g.:
Do you expose your DNS server to the public? If not how do you use it outside of the network? Like on mobile
No he is saying that many smart devices ignore your DNS (pi-hole) as they hardcoded their DNS address to 8.8.8.8. So it is important to have an additional layer to block at the firewall.