I think that would need to be a designed attack, not something that would apply to 99% of websites. The only legitimate resource (that could be used as a canary) being loaded far down a page would be an image (and that kind of requires it to be lazy loading as well).

I don't want to derail this thread, but that's kind of Brave's whole MO. They pretty much constantly put out or source anti-Google content; there's often a grain of truth somewhere in many of them, but not always and rarely reported honestly.