@Gambit2Mate It is. I already illustrated the position can be reached in a different move order, with 4...Nf6 instead. Let me make my point more obvious...
If I asked you what opening this was and you said it's the French Defence... you would be right only on move 1, just like in the Taimanov example you are only right on move 4. This line is quite distinct and separate from the Taimanov, even if they can transpose into each other, just like how this can be transposed into from the French.
If I asked you what opening this was and you said it's the French Defence... you would be right only on move 1, just like in the Taimanov example you are only right on move 4. This line is quite distinct and separate from the Taimanov, even if they can transpose into each other, just like how this can be transposed into from the French.