Oh.
I didn't notice; but i did add it to my GM:Initialize hook.  It didn't work.
Here's part of what it looks like:
function GM:Initialize()
   MsgN("Trouble In Terrorist Town gamemode initializing...")
   ShowVersion()
   -- Force friendly fire to be enabled. If it is off, we do not get lag compensation.
   RunConsoleCommand("mp_friendlyfire", "1")
   
   -- NPC Cvars
   timer.Simple(0.1, function()
		RunConsoleCommand("sk_barnacle_health", "1000")
		RunConsoleCommand("sk_antlionguard_health", "300")
		RunConsoleCommand("sk_antlionguard_dmg_charge", "7")
		RunConsoleCommand("sk_antlionguard_dmg_shove", "2")
		RunConsoleCommand("sk_antlion_health", "150")
		RunConsoleCommand("sk_antlion_jump_damage", "5")
		RunConsoleCommand("sk_antlion_swipe_damage", "1")
	end)