[member="Rex Taff"], no worries. It's possible for me to miss things.
As far as the jamming is concerned, in-character Kre'fey doesn't know about the use of those technologies. So out-of-character, I'm not expecting my jamming to do much; it's just a logical thing for him to try IC.
As far as being jammed, I do see that most of the ships in orbit have frequency jammers. Jammers are not always 100% effective though in all circumstances (
the wookiee page mentions this in the last sentence). This is in large part due to three factors: relative power of the transmitter, location, and distance. As an analogy, think about going with a friend to a rock concert with loud speakers. The sound is going to be overwhelming and will block out a lot of talking, but if you're right next to him or away from the stage, you might be able to get words across. This will become easier and easier the further away from the stage that you are.
From my perspective, that's what's going on with Kre'fey and the Thunder. Those jamming sources are in orbit. In terms of power, they're probably equivalent to Thunder's comm systems. But the Thunder is on the ground probably within a kilometer or two from Kre'fey, whereas the Mando warships are probably at least several hundred kilometers away in space (Earth's atmosphere is 480 km thick, for the record).