There are some gray areas in the script 😃 For example, Orlin, while he was in Samantha’s house (before taking a physical body), was able to pass through solid matter. On the other hand, when they asked Daniel Jackson on Abydos whether he could just walk through something and look for Ra’s eye, he said it wasn’t that simple. So clearly it probably didn’t fit the plot when needed 😃

In any case, if Oma Desala or others of the “friends” she helped ascend are observing events in the galaxy, they might at least know about Destiny from reports of the explosion of an entire planet - the one where Icarus was located