Well considering the death of all the Jedi as soon as 66 was executed, and Hawk has a point, The Jedi could sense what had happened
Telepathy? Jedi don't have telepathy.
Worse still... if there was some sort of Telepathy thing going on Vader and The Emperor would be in fits laughing on the floor trying to find the strength to issue orders to the fleet to wipe out the sanctuary.
I also think it would take a bit longer to get the word out. After all, the story involves the "last of the survivors". If the sanctuary were put into play instantly entire orders would be showing up instead of the few survivors of each.
The wiki must be referring to some obscure comic book or novel. I just know that Anakin, Obi-Wan, Ahsoka and every Jedi from the clone wars did not have telepathy.
They used comm-links and if they became captured they were pretty much screwed.
They could project simple concepts and emotions like: Danger! I'm over here. Help!
Even then the range couldn't be all that great since there are countless times the Jedi were searching for their lost allies.
Not to divulge from the current topic, but perhaps a new thread with Ada as the GM is in order?