The difference is between the broad beam transmissions required between a satellite and an aircraft which can be detected and the tight beam directional stealthy transmissions which link the aircraft in a swarm. e.g.
https://iopscience.iop.org/article/1...0/1/012058/pdf
That may change with LEO constellations such as Starshield which use lasers for secure comms inside the constellation and directional beams to receivers with low latency - but that will be next generation.