Don't most ad blockers also block third party trackers? I know uBlock Origin blocks Google Analytics for example. I don't know Alexa's fallback/tracking method

Don't most ad blockers also block third party trackers? I know uBlock Origin blocks Google Analytics for example. I don't know Alexa's fallback/tracking methods, but couldn't these be an indicator of adoption rate of ad blockers, as these charts are not precisely an indicator of traffic, but specifically a measure of trackable traffic.