Which is why it's bad writing.
"Unblockable killing spell" is the kind of thing that pops up on a middle school playground because every kid wants to have the trump card in make-believe and the last kid just cast Meteor.
Eragon is a contemporary-ish book and has killing magic that can kill normies by the dozens/hundreds, but other magic users have to do more than play rock-paper-nuclear-option.
The ISS has a lot of big solar panels. The other big panels they have are thermal radiators.
They have to have quite large thermal radiators because it's very inefficient. The ISS has people and a very small amount of computing power.
Data centers generate several orders of magnitude more heat. You would need several orders of magnitude more thermal radiators than you would solar panels. The bigger you make the data center, which is important for density since you're introducing a lot of lag due to the speed of light, the less room you have to put thermal radiators or solar panels.
Then you need to work out how to get spare servers, and/or server parts up and down from the Data Center. All of these things are consumables, and all of them have significantly more wear and tear outside of the Earth's atmosphere.
It is possible. It is not efficient or sensible. It sounds cool, it doesn't require buying land, and there aren't currently international agreements about doing dumb stuff in space in the same way there are for doing dumb stuff in the ocean.