If you look closely at the bottom part of the MOC image from which the caption was taken, there are similar bright spots on the adjacent plains.
If that were a reflection, one might expect diffraction spikes, but then again maybe not.

It's also interesting that there is a lack of dunes surrounding the bright spot which would be consistent with a local topographical maximum. Ok, except for that tiny one between the peak and the wall but I THINK that
that is still consistent with duneing.

If I remember correctly, this pic first gained notoriety after Sir Arthur C. Clarke made some comment (which I took as metaphorical or even flipant) about sandworms on Mars. This brought it to the scruitny of a much wider audience, some of whom have a now pathalogical need to "clearly see" artifacts of an advanced civilization.

Come on Stan, there are so much more interesting tidbits out there. Let's have a look....