You say that, but now that this is out it's only a matter of time before the bad guys realize they can stop using their nukes for leveling cities and repurpose them for disrupting HBO.
The sats for HBO are geostationary. Hitting them with nukes is a far cry from disrupting those in low orbits. You would need a much bigger rocket and significantly better aim (GST=35000km vs. LEO=150km).
Except not, because satellites are now hardened against this kind of radiation as a side effect of hardening against cosmic rays, etc.