It's a point of contention as to whether or not this Defiant actually had a cloaking device. There was no mention of one in the two episodes of DS9 it was featured in, suggesting there is no canonical evidence it had a cloaking device. At the very least, after Jack stole the HMS Bounty's cloaking device, they had a problem hooking it up to the Titan due to incompatibility between Federation and Klingon technology. If the Defiant had a cloak, you'd think it would make more sense for Jack to steal a cloak that was proven compatible with Federation technology.
Yeah, I know, then there'd be no TVH memberberry.