centroid details seem contradictory

In the [GLSL ES 3.2 spec](https://registry.khronos.org/OpenGL/specs/es/3.2/GLSL_ES_Specification_3.20.pdf) in relation to `gl_FragCoord`

In section 4.5 it says

> If a fragment shader input is qualified with **centroid**, a single value may be assigned to that variable for all samples in the pixel, **but that value must be interpolated at a location that lies in both the pixel and in the primitive being rendered**, including any of the pixel’s samples covered by the primitive.

Where as in section 7.1.5 it says

> The use of centroid does not further restrict this value to be inside the current primitive.

It seems like section 4.5 says in centroid mode "that value must be ... in the primitive being rendered" where as 7.1.5 says it doesn't.