> While true I do worry that it's mandating a pi 5 for each tile? And who knows how specific it is to the 5.

In the multi-tile array it apparently still only needs one Pi [1] as the FPGAs do the heavy lifting.

[1] https://moonrf.com/updates/

correct, one Pi-5 for the MoonRF. The beamforming computation is done digitally "on the fly" in round-robin across the sixty QuadRF boards.