Yeah that’s my biggest note - radiation is a threat to people long term, but EMP destroying their spacecraft’s computers are the larger threat at longer range. ISS and other spacecraft routinely harden many systems for the increased radiation present outside the magnetosphere, but this kind of attack could easily overload those protections. Honestly this aspect terrifies me because it only takes a few EMP blasts in LEO to start a kessler syndrome situation of debris and dead orbital vehicles whizzing around at orbital speeds. That’s how we ‘lose’ space.