I believe they mean that they don't intend on probing you further about specifics like grades, MCAT, extracurriculars, etc. From what I remember, the questions are very broad and there's a few scenario-based questions as well, so they're more interested in how you respond, rather than investigating your history.
The interview is 100% blind (during mine last year, they knew nothing other than my name). I was never discouraged from discussing past experiences, and you should definitely bring them up if they are relevant and you feel like it will help you answer the question, but it isn't their intention to ask further specifics about them.