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I can kind of see how it might be true. If you take a group element, differentiate it wrt the group parameters to pull down the generators, and then evaluate this expression at the origin of the group manifold, ie the identity element, you are left with just the generator. So by differentiating a group element at the origin you get a generator. But this is not quite the same as differentiating a curve in the group manifold at the origin and getting a generator.