Astutely spotted.
As a Monstrous Creature, a Talos will block line of sight. The reality is that it would be very difficult to obscure enough of a Raider or Ravager to protect them with a single Talos, but it might be possible to hide a vehicle with the aid of a large piece of terrain.
The only question mark is whether the skimmer nature of the Talos prevents it from blocking line of sight. I would imagine that it isn't a full blown skimmer, so would be like any other monstrous creature.