Glad Rag
That was a near-earth orbit ASAT shot (865km away), the Ku sats are in geo-stationary (35,000km away). To shoot down a geo-stationary you would need to perform a Hohmann Transfer Orbit - that would give the defending satellite about 1/2 a days' notice that it's coming. You then just manoeuvre the satellite after the ASAT missile is on its way and it misses by miles.
By the way, most ASAT missions will commit fraticide of one's own capability as well. Also, if you go for an exo-atmospheric nuke then it would probably quickly escalate to about 20-30 minutes of "exchanges" and then the Cockroaches would inherit the Earth.
ASAT against anything above LEO just isn't a viable tactic in my opinion without risking all-out war.
The B Word