OpenWrt Adguard Question DNS

Installing and configuring adguard did a dns leak check.
This address shows up and wondering its safe or not?

The dns test results

The dns server

The dns block list

Quite sure, that your reported DNS-server belongs to quad9:

https://support.quad9.net/hc/en-us/articles/4422044032781-Quad9-Network-Providers-WoodyNet-PCH-net-i3D-GSL-Networks-EdgeUno-Equinix-Metal

Nothing is 100% sure in the internet.
You can use this link to check whether you are using quad9:
https://on.quad9.net/