I'd disagree. Not managing fatigue comes under insufficient training/lack of skill, so to me it's the same thing.
Was the distraction caused by fatigue and letting you're mind wander when you usually wouldn't have given such a thing a thought? Can't really quantify that sort of shit so they just say 'you were speeding, speed was the cause'.
For some reason in my mind I've always likened it to watching the combination of factors when you're outdoors (wind, moisture, and temp) which you don't really want to have a combination of two of for very long (like driving tired at night while the heater is cranked and you're listening to some acid jazz, bad combination

where as the same tiredness and quietly munching away on something during the day might not even register until you relax at your destination and the fatigue kicks in.)
On a bike the outdoors factors even come into it. How many bike riders have dropped the hammer and fawked up a corner because they were actually succumbing hypothermia and their decision making functions were on the way out the window? Statistically they are just another speeding motorist because they can gather from the scene that they were going to fast, but not what condition they were in.
That's just my own take on it all anyway, the fuzz I'm sure are happy with the simplifying 'for the good of the people' somehow, well clearly they are

.
Bookmarks