That is indeed how it has always been, the results of being out of synapse actually gave an advantage for some creatures in the last codex with the changes to Rage USR, so it was juyst put back to being a negative, although, you CAN get a positive from it, people talk about thier bugs eating each other, but thats just bad mathhammer assuming that Gaunts are in a vaccum, IF they're out of Synapse and not in combat And they fail the LD test AND then roll under 4 on a d6 they then take some hits at str 3, its not like you can shoot a Tyranid warrior and all the gaunts will suddenly eat each other.