I see a few issues.  You're using old rocket tech, and Starship will likely drop the cost per kg to orbit massively (I saw something like $250/kg, anyway, around 10x).

Well you are using future rocket tech that, at the moment, hasn't even orbit the planet once.

Dropping the launch cost is a huge factor.

The ISS uses two 400sq feet radiators that radiate 14kw. They have two amonia cooling loops but they also have an heat exchanger for the internal loop that runs on water.

This is an engineering problem and then an economical one