OK. Now that Pi-Hole is seeing the nVidia box, you might still get some ads on various platforms (YouTube is one).
Pi-Hole is a domain blocker, and typically ads have been served from separate domains than the content. By identifying and blocking the ad-serving domains, you can block the ads. Your subscribed blocklists are lists of ad-serving (or malware or phishing, etc) domains.
What YouTube and others are starting to do is serve the ads from the same domain as the content, but using a rotating subdomain. Pi-Hole can't block the ad domains without also blocking the content. It's a never ending cat and mouse game.
Note that even if you are unable to block the YouTube ads completely, your Pi-Hole is still blocking a lot of other content (tracking, ads, etc.) for other domains (Neflix, etc) on the nVidia.
Here are some related threads (long in the first case). I recommend reading them all for some insight.
https://www.reddit.com/r/pihole/comments/8hetls/a_question_and_my_youtube_and_spotify_blocklists/