it's even more possible to do this legwork on your own (which it sounds like is along with your current thinking after the call). The reason I say that is you can get coaches' attention with raw numbers. In sports like football, basketball, etc., great statistics might be explained by things like sub-par competition. So a scouting service can help coaches filter through the noise, and video highlights can help coaches see things like footwork, secondary skills, body control, and other things that will help them determine how representative the gaudy statistics are, how much room for improvement there is, how coachable the player might be, if there are serious shortcomings in other phases, and so on. And, conversely, a player who doesn't have outrageous statistics but has upside and has some very specific skills might get more use out of a recruiting service because the service can highlight that.
But in track, a low time is a low time. I'm not saying technique isn't important (certainly more in some events than others), but your son's times will carry weight, especially if he is actively engaged in investigating programs, in reaching out to coaches, and so on.
Anyway, congrats to you and your son on getting to this point.