If you read Gina Perry’s critique, her conclusions is that fewer than half of the participants thought it was real. These were Yale students, so probably smarter than average, and the study didn’t do a very convincing job make it seem believable from what I’ve read. When I took psychology in college I had to submit to random experiments to as part of my grade (there were alternatives but the experiments were easier).…
I did one of these experiments around 2011, and because it was so obvious that the experiment was contrived, there was a lot of misdirection around the actual experiment, which was testing something totally different from the pretense. Like different responses to font color or something like that.