Sorry I didn't quite follow. What method? Hyperdiction? They're still doing it!
I mean IF (and it is still an if) they predominantly exist in hyperspace, it may be disadvantageous to them to bring us into normal space, where perhaps we are more comfortable than them. So why would they do it, rather than scan us in hyperspace itself? As M.Volgrand suggested, perhaps it is deliberately for our safety, and / or the technology is too limited or unstable to control, so they must also rely on normal space to scan us. They may have to do this quickly before they or their ships take too much damage.
Let's see if ex-President Halsey disappears into the strange lights again
Thye're probably sick of Goatboy