Interviewers have an unearned and irrational confidence in their ability to discern character, performance, etc. from personal interviews. Anyone who thinks s/he can accurately and consistently "read" people in interviews is self-deluded.
Here's one source on the topic
https://www.psychologytoday.com/us/...dictors-job-interviews-are-useless-and-unfair. (I haven't done anything remotely close to an exhaustive lit search on the topic, this link is meant as food for thought, not proof.) I've personally done a lot of interviewing, and I rarely feel confident at the end that one candidate is THAT much better than others. The decision often hinges subjective feel, never a good indicator of accuracy, and boy did I/we make some doozy mistakes as a result.
I don't know if these interviews are unstructured or structured, the latter is preferred as per the linked article. They are probably more structured. But, I strongly suspect they involve a non-trivial level of irrational self-confidence in one's interviewing and discernment skills. Frankly, I put little stock in them.