image from bigger gravity or d_u and a thought experiment about speed of light

1. a correction for image from region of bigger gravity or d_u (interior length).

An observor shall see space or objects in a region of bigger gravity/d_u being smaller than they actually look like by another observer in the region. Also an observor shall see space or objects in a region of smaller gravity/d_u being bigger than they actually look like by another observer in the region.

This is because:

for light to travel smoothly between space units of different d_u (interior lengths), all space units must be treated as same standard outerior frame/grid size d_p for light to transpassing between, so space unit of bigger d_u will look like shrinking to d_p when light transpass to other space unit of smaller d_u,

so when oberver is in a region of smaller d_u to see light from another region of bigger d_u, the image of space and objects in another region will look like being shrinked when light transpass to the region of observer,

but when observer is in a region to see light from another region of same d_u, the image and space in another region will look as exactly same size,

so in fact d_u=c/f_g which means space interior length increase proportional to 1/f_g can also be interpreted as the length of a singal/object inside a space unit shrink proportional to f_g/f_p.

2. a thought experiment of light speed

I have an argue with Grok about an thought experiment of light speed, in which we can not convince each other.

Supposing there is an oberser on the surface of SUN. There are 2 points A and B far away from the observer. The light needs exactly same time from A and B to SUN. There is extremely low or 0 gravity field on the direct route from A to B.

And there is a semi-reflection mirror at A, and a light entering A will partially pass througth to B and partially be reflected to the observer, and light from A to B will be reflected by B to observer.

So the observer can know the time that light needs to travel from A to B by the interval that the observer receive the light from A and B.

And the observer knows the accurate distance from A to B.

I told Grok: by the interval between receiving light from A and B, the observer will measure that light speed from A to B is faster than constant c, for the observer’s local f_s is much lower than the local f_s on the route from A to B.

But Grok cant agree and think that the observer will measure that light speed is still no more than constant c.

What’s your opinion?