Notre Dame coaches have access to a LOT of information that we and paid websites and recruitniks do not have the slightest chance of gaining access to.
Transcripts. Difficulty of courses taken, actual grades achieved, class ranking, ability to visit the high school and talk to coaches, principal and teachers and find out if this young man can fit in and succeed at Notre Dame. Getting to know parents and/or guardians etc. etc.
I think the coaches have to work very hard to find out all the relevant information. But, I believe the Notre Dame coaching staff has a pretty good idea of when a recruit is just trying to look good and smart by mentioning Notre Dame and when the recruit is really interested.
I do not think this is rocket science for the Notre Dame coaches. I commend them for working hard to find out the recruits who are genuinely interested and genuinely capable of succeeding at Notre Dame and working hard to get them to come to Notre Dame.