Or, I guess I should say the anti-cloak abilities are broken. The final battle with the dreadnought is very similar to that in Khitomer Accord. However, the abilities that normally disable cloak do not work in this mission. Charged particle burst does not disable her cloak (and I run version 3, fully specced into it on my sci toon.). Nor does eject warp plasma (again version 3 on my eng toon). I have not tried gravity well or tractor beam yet.
They did have patch notes about changing tractor beam's effectiveness on the Scimitar, it might have affected the other abilities too.
I think its really annoying and stupid, honestly, because cloak detection/revealing is so useless in PVE, that it would be nice for it to come into its own in these Scimitar fights. If it makes it too easy, then good! Lots of other powers make other fights super easy.