Even if it's not standardized, a rubrik across X attributes with a scale and a number. (Which is what I am assuming they are doing anyway -- as it sounds likes the interviewers are rating them across different dimensions)
Not sure if this is some sort of a thing to do with liability but the interviewee can get generalized feedback.
Ex: Technical skills (2/5),Communication skills (4/5) etc. and they can improve on the relevant dimensions or compare notes with other companies / candidates as well.