Oh, certainly. I'm just saying that his stats are probably artificially inflated a bit- they'd certainly be damn good without whatever enhancements he has, but not quite so ridiculous. He'd probably be down one or two points from WS, BS, I, and A (so maybe something like WS 7, BS 5, I 8, A 4), giving him a statline that's still incredibly good but not quite so much of a murderblender.
I think people here are discounting the power of outliers.
Think about it this way, in layman's terms: every group has outliers. Outliers, however, are a percentage, not a flat number. So a bigger group would have a bigger flat number of outliers, as 1% of a million is way bigger than 1% of 100.000. But wait, if there are so many outliers, then there are probably outliers among the outliers. And then, if the group is even bigger, outliers among the outliers among the outliers, and so on.
This is a big reason for why humans often produce legendary champions that can go toe to toe with the elder races, imho, they just outnumber them so much that the 0,00001% is >1 . Skaven and orcs, however, get even more of this outlier fishing due to their absurd birthrates. So they have people who are far, far, far above the average much more often.
Of course, the major difference between humans and orcs/skaven is that human societies are built so as to maximize the percentage of outliers in one way or another (Grail Knights and Damsels in Brettonia, Lord Magisters and the favour spellcasting priests/strong warriors gain in the empire, etc. etc.) while Skaven and orcs actively work to minimize it through backstabbing and dusfunction culling many geniuses who'd have survived in a human society before they reach their full potential. But even so, the power of outliers granted by having big population numbers are not to be underestimated.
... At least, not in a fantasy setting where heroes can get that much more important than the average citizen and where there is no real power cap. There are a lot of other factors to consider in real life, where no man is an island, but in a fantasy setting where men can be islands to an extend, it would most likely work that way.