Techniques evolve in all fields over time. McClaren may have kept up with these changes, he may not have. Somebody who’s just getting started will obviously be more aware of the newer styles/techniques as they’re studying for badges etc…
Again, I’ve no idea if he is up to date or not. You do also get young coaches who stubbornly cling to techniques that outdated them by decades depending on their viewpoint. There is some merit to McClaren possibly having blind points that a younger coach wouldn’t.