Related, I don't get how the foundry is powered. It doesn't seem to have a power connection and I initially thought it's lava-based (like stone/steel furnaces are powered by fuel), but the LDM recipe doesn't use lava (and I understand it's supposed to be usable on other lava-less planets, too).
Edit: now that I look closely, the big miners don't have power connections too. It's possible that they had a substation out of frame in both videos, but maybe they hint at some other power distribution mechanic? And no, it's not free energy since there's a specific mention that it uses a lot of energy.