Boomers move pretty slowly normally. There are photos of earliest 093s moving while surfaced and there wasn't even much wake. I find the idea that the recent 094s can cause much wake while submerged in yellow sea to be quite dubious. After all, propeller technology likely have improved quite a bit since those early 093. Also since boomers aren't expected to move quickly, they also use propeller technology that emphasizes reduced wake rather than higher speed.Hahah, no comment
For wake detection, a MPA is not better (if not worse) than a satellite. I must enhance that constantly tracking is almost impossible but a large scale static map is highly possible.
SSK has much less wake flow because of its slow speed, small volume, low power and the advantage of stopping the whole power system (if SSBNs linger in shallow water, thermal wake will become obvious soon)
094s likely operating area should be well known to us navy by now. It significantly expands on the surface area that would have to be targeted to eliminate second strike capabilities.