In the conversations between college coaches and NCAA it was organically determined that coaches can only coach athletes by rule if they are named official coaches.
However they left out one important rule that makes this alright for most athletes.
The NCAA allows every athlete one 'foreign tour'. Meaning once in their 4 years of eligibility in NCAA athletics their coaches can take them to Europe to compete in major meets weather they are the world championships or not.
So technically they could have used their athletes one international tour to get over seas.
I think there may have been one conflicting rule in this though. Because their is a rule saying the team can take them on an international tour once in their four years. But there is also a rule stating that coaches can only coach at world championships if they are selected as the countries 'official' coach. So this means that the international tour is only acceptable if it is for non championship meets. So LSU could pay to take their assistants to diamond league meets, but not the Olympics.
But then if they used the Olympics as their one time foreign tour it may not work for some athletes that have already been over seas for world championships.
This mainly just goes to show that a lot of rules that are made by the NCAA were not made for track and field and should not be enforced to track and field athletes. For example, lets take a look at basketball. They have a head coach, Coach K. And they do not need every athletes team coach following them to the Olympics. But that coach coaches them as a team. In track and field no matter who they name the team coach, in any event except working on relay hand offs, no one is going to do work outs or technical training created by the 'official' track coach.
You work with one coach for years, you would never change something because someone u just meet a week ago told you to. Everyone knows USATF 'coaches' are just formalities. They really do not even all get picked because they have good athletes.