You have misunderstood what some people mean when they say “linear sRGB”. That is a term that means linear color space with the gamut of what used to be an sRGB color. It is no longer an sRGB color, but it’s safer to transfer back into sRGB later, there are fewer worries about whether your colors will be clipped to the wrong bounds. The term “linear sRGB” helps you understand the provenance of your inputs, it does not mean your color values are in the sRGB color space.