You can transfer heat from the AI chips to the radiators however way you want (conduction, convection(using a coolant)). But that’s inside the closed system.
Transfering heat from the closed system to the heat sink (deep space looking from the permanent shadow regions of the moon) will only work with radiative cooling. The limiting factor is still how much heat can be *radiated* into deep black space. That was my point.
Yes, space-directed radiative cooling is maximum and continuous because no solar radiational heating.