This is false. It’s pretty straightforward to prove using Stefan-Boltzmann. Radiating from both sides at 300K, a square radiator that’s 1 meter on a side emits 920W.

Additionally, you wouldn’t use cutting edge 35% triple junction cells for a space datacenter, you’d use silicon cells like Starlink and ISS use. 22% efficient with 90% full factor, given 1350W/m^2 and thus 270W/m^2, to provide enough power for that radiator you’d need a solar panel 3.4 times as big, and that’s if you were in 24/7 sunshine. If you’re in a low orbit that’s obscured almost half the time, it’s 6-7 times as big.

Why do people keep making these obviously wrong claims when a paragraph of arithmetic shows they’re wrong? Do the math.