Unless they captured a ship that did cloak and reverse engineered the system.
Join Date : September 2010. Still boldly going forward because Cryptic couldn't be bothered to install reverse.
I am currently unsupervised, anyone who know me will tell you that this will most likely lead to trouble. =3
I think that in Typhoon Pact they get cloak from Romes
The Typhon Pact doesn't exist in the STO universe, so no-go there. Furthermore, if the Breen got cloaking tech from the Romulans in Typhon Pact, it probably means they didn't have it before that, therefore they still don't have it in this universe.
But yeah, I wouldn't put it past the Breen to use energy dampening on themselves as an MES of sorts.