I thought the plan was to transport the H3 back to earth, use it here and transport the generated electricity in the usual way. It’s low mass fuel, and the moon’s weak gravity wouldn’t be a barrier to transport. The concept of microwaving the energy to earth comes from a different paradigm - having orbiting solar generating stations, in which you would need some way to wirelessly transmit the energy to earth.
And while the downlink area might not be dangerous, and further might not be heating the world, or causing environmental harm - there’s not a shred of doubt in my mind that the envirowackos would claim that it did do all those things.
It might be very economical to bring the H3 back from the Moon; the sample return vehicle wouldn’t have to be manned. The problem remains that no one has demonstrated feasibility of controlled fusion. Without that, the H3 may as well stay where it is.