I don’t doubt it exists but I do think observation and deductive reasoning account for 80% of it. The gut feeling or intuition are a bit different.
I’m pretty good at predictimg what people I know will do but with strangers my accuracy falls way off.
These appear to be classic “double blind” types of experiments. If experiments were conducted where somebody knew the other person or whatever, that would not really fit the description and might not pass peer review.
But I understand what you are saying.
The author makes some interesting observations and speculations that extroverted people seem to perform better than introverted ones.
It’s an interesting study but I am not sure the effect was statistically significant. The key here will be repetition.