Isn't this the most expected result? How could it possibly be anything else?
But would this experiment yield the same results today? For people in certain demographics or below a certain age, I think almost certainly not.
I also think that a lot of the people who would've easily identified the 24p clip back in 2004ish when this class took place may no longer do so now. I never would've thought this before 2018ish, but I had experiences with people around and since that time that surprised me and turned me completely around on this view.
Though there is one other alternative that that I wouldn't have difficulty believing. I think it's possible that more people than I just predicted would identify the 24p clip as "cinematic", but that they may not view it as a desirable look, inherently more dramatic, having much impact on the viewer, etc.