I'm afraid getting permission by the tower has nothing to do with breaking FAR's, if he exceeded a speed limit or operated the low approach below 500 AGL, he could face certificate action. Most professional pilots understand this.
Not a pilot, just curious and a bit confused about your post.
1 - Never read anywhere that he exceeded a speed limit?
2 - Also, never heard of a low approach limit of 500ft AGL, unless something else is on the runway (German rules, I guess they are same or similar elsewhere). Where did you take that figure from?
Regards,
Robert