This guy rolled inverted, yes well executed, but that does not change the facts. (If you kill someone but do it skilfully, does that make it OK?). The rules are there to protect. What if he made a mistake ito his energy management or evaluation of the conditions? At relatively low level? What if he was not on top of his game at that particular day and misjudged the speed and g-load? You condone this kind of behaviour, it says something about you.
Nige - if he retains positive G throughout, the helicopter doesn't know whether it is inverted or not and there is no difference in the stress on the aircraft at that point than there is in a 'normal' wingover.
As someone pointed out earlier, the recovery with high speed, if you let the nose drop on exit too much, is probably the most stressful - but no more than flying at VNE when heavy and encountering some chop or turbulence. Would you sack a pilot for having that experience and 'overstressing' your aircraft?
Rules are not written in terms of what the aircraft knows. Mostly they are written in blood.