Won't help, unless @amirabdi is willing to manually set DNS on all their home devices. The Arcadyan/Wi-Fi hub will happily ignore any upstream DNS you feed it, and will instead push its own LAN IP as the only DNS for IPv4 clients via DHCP. Trying to ...
I should add that using the Hub's built-in firewall or port forwarding feature in order to block/redirect DNS requests sent to the Hub's LAN IP does not work. There is truly no method to shut down that built-in DNS server or change its behaviour.
That does not work. The TELUS Wi-Fi Hub will always have a DNS resolver running on its LAN IP, that DNS resolver will always bypass *any* upstream IPv4 or IPv6 DNS that you defined in its config (you have the right steps in your article), and finally...