The router is not advertising Pi-hole as DNS server, it is advertising its own IP:
*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
Scanning all your interfaces for DHCP servers
Timeout: 10 seconds
* Received 548 bytes from wlan0:10.0.0.1
Offered IP address: 10.0.0.33
Server IP address: N/A
Relay-agent IP address: N/A
BOOTP server: (empty)
BOOTP file: (empty)
DHCP options:
Message type: DHCPOFFER (2)
server-identifier: 10.0.0.1
lease-time: 80103 ( 22h 15m 3s )
netmask: 255.255.255.0
router: 10.0.0.1
dns-server: 10.0.0.1
--- end of options ---
DHCP packets received on interface wlan0: 1
DHCP packets received on interface eth0: 0
DHCP packets received on interface lo: 0
You have multiple IP's assigned to the Pi, on different ranges:
** [ DIAGNOSING ]: Name resolution (IPv4) using a random blocked domain and a known ad-serving domain
[✓] nutritioncigarheading.com is 0.0.0.0 on lo (127.0.0.1)
[✓] nutritioncigarheading.com is 0.0.0.0 on eth0 (192.168.1.166)
[✓] nutritioncigarheading.com is 0.0.0.0 on wlan0 (10.0.0.33)
[✓] doubleclick.com is 142.250.65.174 via a remote, public DNS server (8.8.8.8)
The active interface appears to be wlan0, but Pi-hole is configured for the eth0 interface:
** [ DIAGNOSING ]: Setup variables
IPV4_ADDRESS=192.168.1.166/24
PIHOLE_INTERFACE=eth0
Run pihole -r
and select reconfigure to set up Pi-hole for the active IP and interface.