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Relatively speaking... no they are not. Or at least not flexed to near their limit (which is important with aluminium, because that's what makes it harden).
Back to the op... here is that zinn article:
http://velonews.competitor.com/2002/12/bikes-and-tech/technical-faq/technical-qa-with-lennard-zinn-carbon-forks-2_3270
miro_o
redeye
But in all fairness, aluminium frames are also subject to a lot of twist and flex, especially in the extremes like the seat/chain stays and head tube area, think when riding hard out of the saddle, but I appreciate your point about erring on the side of caution