The numbers are off. You can't have votes be your basis in how many people took the test ( I didn't vote for example) and you can't have the amount of 8/10 comments be a metric for the sole count of people who scored that much. The numerical game can't be played here because the information is too cloudy.

That being said, anecdotally a good number of people got 8/10, 9/10 and 10/10 which anecdotally makes it likely to be statistically significant. Hard to say quantitatively but we can make a qualitative prediction here.

I think that everyone that upvoted played the game. So I think that at least 241 persons played the game. (The actual number of players is probably way higher.)

If you assume that players have no knowledge, With 241 the expected to number of persons with 8/10 in 10, and with 10/10 is 0.2. (The actual number of players is probably way higher, so these expected values are way higher, but we must not count lurkers.)

Last time I counted, I found 6 comments that say 8/10, so even if only 241 persons played and none of them have any insight, it would be underreported. This is not unexpected, not everyone is posting the result.

Last time I counted, I found 3 comments that say 10/10, that's much more than the expected value if only 241 persons played and none of them have any insight. So that's slightly interesting. (Did a lot of people get 10/10 and didn't upvote? The people that say 10/10 is lying or cheating? Do they recognize a few of the photos and were lucky in the others? Do they have a sixth sense to recognize serial killers?...)