Second, what the satellites are doing today is (also highly probable) to be of less importance than what they may be capable of doing under contingent circumstances.
This was my thought too, or more generally: why would they do this? What are the benefits to them? I doubt stealth as you'd have to expect someone would notice at some point. Does it complicate jamming? Or simply an otherwise unused band so plenty of available bandwidth? Are the usual channels getting too crowded?