The output of these commands shows that the client is using Pi-Hole as the DNS resolver. Let's see if queries are just not making it into the dashboard.
From the Pi terminal run the following commands (no need to post the results, we just want to get some activity into the log)
dig cbc.com
dig abc.com
dig nbc.com
After those run, then what is the output of the following command:
Now let's try one more step. We're going to live tail the pihole log at the same time we load a know ad-infested page on a browser on the same client that you verified was using Pi-Hole for DNS.
Run pihole -t from the Pi terminal.
Then, load cnn.com from the browser. You should see a burst of activity in the Pi-Hole log and no ads on the cnn page. For comparison purposes, this is just the first of what I see in the Pi-Hole log when I load that site:
Oct 9 22:08:16 dnsmasq[25543]: query[A] cnn.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: forwarded cnn.com to 127.0.0.1
Oct 9 22:08:16 dnsmasq[25543]: reply cnn.com is 151.101.65.67
Oct 9 22:08:16 dnsmasq[25543]: reply cnn.com is 151.101.129.67
Oct 9 22:08:16 dnsmasq[25543]: reply cnn.com is 151.101.1.67
Oct 9 22:08:16 dnsmasq[25543]: reply cnn.com is 151.101.193.67
Oct 9 22:08:16 dnsmasq[25543]: query[A] www.cnn.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: forwarded www.cnn.com to 127.0.0.1
Oct 9 22:08:16 dnsmasq[25543]: reply www.cnn.com is <CNAME>
Oct 9 22:08:16 dnsmasq[25543]: reply turner-tls.map.fastly.net is 151.101.185.67
Oct 9 22:08:16 dnsmasq[25543]: query[A] cdn.cnn.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: forwarded cdn.cnn.com to 127.0.0.1
Oct 9 22:08:16 dnsmasq[25543]: query[A] www.googletagservices.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: gravity www.googletagservices.com is 0.0.0.0
Oct 9 22:08:16 dnsmasq[25543]: query[A] c.amazon-adsystem.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: gravity c.amazon-adsystem.com is 0.0.0.0
Oct 9 22:08:16 dnsmasq[25543]: query[A] static.criteo.net from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: gravity static.criteo.net is 0.0.0.0
Oct 9 22:08:16 dnsmasq[25543]: query[A] www.i.cdn.cnn.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: forwarded www.i.cdn.cnn.com to 127.0.0.1
Oct 9 22:08:16 dnsmasq[25543]: query[A] agility.cnn.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: forwarded agility.cnn.com to 127.0.0.1
Oct 9 22:08:16 dnsmasq[25543]: query[A] amplify.outbrain.com from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: gravity amplify.outbrain.com is 0.0.0.0
Oct 9 22:08:16 dnsmasq[25543]: query[A] cdn.cookielaw.org from 192.168.0.135
Oct 9 22:08:16 dnsmasq[25543]: forwarded cdn.cookielaw.org to 127.0.0.1
We have established that the Pi-Hole is blocking domains as intended. The example of cnn.com is conclusive. You will continue to see ads on YouTube (and Facebook and some others) since they serve the ads from the same domains as the content. If you block those domains, you lose your content.
Looking over your debug log once again, I see that your privacy level is set to 4 - this accounts for the lack of logging. You have disabled all logging and statistics. If you want the query log and stats, you will need to select a lower privacy level (0, 1 or 2).