If YouTube blocks your player due to your ad-blocker, they are clearly telling you that they no longer want you as a visitor, and you can rest assured that your client did not download any ads. Using your argument, this is a win-win situation.
In reality, however, this is just a dumb justification for unethical behavior because people with ad-blockers will just investigate how to circumvent anti-adblock measures, to keep consuming content for free.
And this behavior is akin to software piracy, which ensured monopolies thrived. Just as in the 90s, when software piracy helped companies like Microsoft or Adobe to own the market, YouTube is now a monopoly thanks to people like you. Because alternatives, like Vimeo or PeerTube, can't differentiate by being ads-free.
And now, the monopoly, which ad-blockers helped create, is used as further justification for the existence of ad-blockers. Funny how that works out.
I wouldn't care, except the writing is on the wall for where this is going. In truth, ad-blocking still works simply because publishers like Google still allow it to work, by not investing in anti-adblock tech or lobbying for legislation that bans it altogether (e.g., DRM). It's either that or paywalls everywhere. And this will hurt the open web, much like how software piracy hurt general-purpose computing.
Enjoy the freeloading while it lasts.