This image is from the Phillips 272G5DYEB Gsync monitor. It's showing ghosting. This test was done to show the effect of "SmartResponse", their overdrive. If you look at every monitor review where they do this test (There's nothing invented special here. They do them all of the time.) you'll see ghosting on every monitor, Gsync, Freesync, or not.
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This "test" that PCPer did, has it ever been used in any other reviews? Not that I'm aware of. We've seen PCPer do this type of thing before, which is why I'm suspicious.
Your suspicions are baseless.
PCPer's comparison was done using AMD's demo which had a white windmill on a black background. On the swift with standard overdrive, there would be overdrive artifacts on the trailing edge of the windmill. However an overdriven white-to-black transition is not easily visible! I leave the reason for that as an exercise to the reader

If you have a decent monitor with okay calibration, you should be able to see the overdrive artifact on the ROG Swift in the above image.
Had the windmill demo taken place on a blue-ish background, you would have seen the overdrive artifact show as a noisy shadow behind the windmill blade.