No, I think it's valid to say that the USSR was not socialism. That doesn't mean that the USSR was good, or that socialism is good, it just means that they have never been the same thing. (Unlike Chomsky, I am not concerned to save or favorably present either one, they simply have never been the same)
To be more specific, it wasn't even a simple readout of Marxism - hence the creation of separate terms like Leninism and Stalinism and Trotskyism and Maoism. I am not defending Marx, but one's disagreement with an entire class of people does not remove their significant internal disputes.
But the USSR used the ideas and words of socialism as justification quite a bit. That is very significant. It certainly justifies skepticism about anyone selling socialism, and about the robustness of socialism in the face of conditions like the establishment of simple old-school dictatorships by ruthless butchers.
To be more specific, it wasn't even a simple readout of Marxism - hence the creation of separate terms like Leninism and Stalinism and Trotskyism and Maoism. I am not defending Marx, but one's disagreement with an entire class of people does not remove their significant internal disputes.
But the USSR used the ideas and words of socialism as justification quite a bit. That is very significant. It certainly justifies skepticism about anyone selling socialism, and about the robustness of socialism in the face of conditions like the establishment of simple old-school dictatorships by ruthless butchers.