I'm trying to visualize how it might be set up, from the perspective of the satellite... If you're familiar with how an o3b satellite uses numerous relatively focused high-Ka-band spot beams, I'm imagining each of these 4000 satellites doing something similar but with much smaller spot beams and tighter focus (but also the satellite is smaller, lower power and has smaller antennas so less gain).

The really curious part is how the satellite to ground trunk link will be accomplished, if they're going to try to build something like a modern version of the satellite-to-satellite links that Iridium satellites use, but at much higher capacities, draining traffic from multiple satellites through whichever one happens to be over a gateway earth station at a particular time. Or perhaps the satellites will be able to do that and also opportunistically connect to operator-owned earth stations when they are in LOS.