From the article:
"The 2017 BMW 5-series with "Driving Assistant Plus," 2017 Mercedes-Benz E-Class with "Drive Pilot," 2018 Tesla Model 3 and 2016 Model S with "Autopilot" (software versions 8.1 and 7.1, respectively) and 2018 Volvo S90 with "Pilot Assist" were evaluated."
The AP1 (2016 Model S) and AP2 (2018 Model 3) cars weren't running the same version of code, so you can't really make the blanket statement "AP2 beats AP1" based on that evidence.
(I personally am not claiming that either AP1 or AP2 is better by any particular measure. I've only driven AP1 and non-AP cars.)
Bruce.