I don’t know what you’ve been saying but what these guys are talking about isn’t what I consider a serious concern. It’s more of the “oh this is going to be so massive, it will transform everything” warn-bragging they’ve been doing from the jump.
Radiators work because they have something to radiate heat into. Space is famously empty, so a radiator the size of a planet would only work as a heat sink until the total heat in the system was high enough to make everything glow like a heating element, at which point you dump waste energy as visible light.
This is what I’ve been tearing my hair out over any time this comes up. If you put a computer in space it will heat up until it achieves incandescence. Which is bad for the performance.
Plot twist: the song is Fuck the Pain Away.