[forkbanger]

Q. Is the Talos a monstrous creature or a skimmer?
A. The Talos is classified as a monstrous creature and as such uses all the rules for Monstrous Creatures rather than skimmers.

It has a 6" move and a 6" assault range, but can move over terrain.

 

[forkbanger]

Does this mean it has move through cover rule or does it move as a skimmer over terrain?

Move as a skimmer over terrain, with dangerous terrain tests for taking off or landing in it, I believe. I'll find a DE codex and check.