So when I read it this is what I think. They were saying that Gysnc was first presented as a hands on Demo and everyone got to actually experience it, play games with it, and was a full hands on experience. We know that nvidia brought press and developers in to actually experience Gsync first hand, in games and in real time. They could turn off and turn on the feature and see the results, as well as feel it.
So with this in mind, they are saying the freesync demo was just a visual demonstration. Hey, look at this video monitor demonstration with A sync on and look at this one without it. They could see the difference but was not at all a hands on in any way shape or form. So its hard for them to measure it at all.
Honestly, the fact that freesync has not been demoed in gaming still to this day should at least be concerning.....I know i find this really interesting and a little......strange.