I think you're nitpicking. The term "colourspace" is used to refer to the actual colourspace plus the nonlinear transfer function. The sRGB spec defines that transfer function.
You can nitpick and say that the "sRGB colourspace" is linear but it's still true that sRGB is nonlinear.
You can nitpick and say that the "sRGB colourspace" is linear but it's still true that sRGB is nonlinear.