I’s think the details would be classified. I suppose they could be overloaded but with that many high altitude explosions they’d probably be better off just targeting the launchers directly.
North Korea and Russia have satellites that orbit over the US at all times. Many claim there are EMPs on them. I did not hear about the NK’s level of sophistication, but I hear the Russian satellites have EMPs that are stronger than the protection the 30-50 year old installations have
Russia and China have “super EMPs” for which we supposedly do not have protection against.