you r absolutely right, the reference sapphire is flashable, but the new version with the same name and specificcations is not. i mean the new sapphire 2GB, besides the flex, which is not flashable either.
the problem with the term "reference card" is that it has lost its meaning: the first reference cards of practically all brands were flashable, but what is now sold as reference card is usually a non flashable version. so telling people that the reference sapphire 2GB is flashable would be untrue if we are talking of cards recently produced and currently being sold.