> legitimate leadership technique
What do you mean?
If by "legitimate" you mean effective, then sure; linux kernel development seems to be humming along and providing value to lots of people.
If by "legitimate" you mean socially acceptable, then I'd look to the large community that seems to find little problem with "Linus language".
If by "legitimate" you mean causing no harm, then perhaps you have a case. Linus does seem to get under some people's skin. But what are our priorities, really?
From a stoic standpoint, Linus' words have nothing to do with anybody but himself, so it says a something about me or you if we get bothered by him.
However you look at it though, Linus is a human just like you or me. If we dislike him, then we're free to ignore him and move on; why spend time trying to argue what he "should" be doing?