Not sure why it’s important, but I think we can all guess the school and the placement is likely close to what he claims. Maybe it’s top 60 or whatever. Does it really matter that much? This school is NOTHING like a standard high school. I think that’s his point, not the exact number.
There are indeed some top high schools in the nation where the numbers are nothing like the normal bell curve. This also goes for extremely well known privates esp the small ones which have chosen kids based on skills in the 8th grade. These kids are often outstanding athletes, artists, athletes, etc. So their matriculation isn’t going to be anything like the local high school ( even in a town with a high SES).