I never said there was one, I said there were two, but each was akin to "half" an ALU since only in combination did they have the full set of SIMD operations. We are all aware of the terminology "shader top/alu top" and "shader bottom/alu bottom" used to refer to this split. The NV4x thus had about sort of a "1.5 ALU" per pipe. Now, the "shader top" part of the NV4x has been upgraded so that it is now capable of pretty much everything the shader bottom is, so one can say that the G70 has 2 full ALUs per pipe, whereas before, it did not.
Now matter how you slice the semantics, the result is the same. 2x the dot-products.