My wizard is up to Act 3 inferno solo. The guide really makes no sense at high difficulty. Any channeled beam spell like disintegrate is asking to get 1 shotted, even with 20k absorption on diamond skin and force armor up.
For the majority of mobs you're either going to nuke them down with arcane orb before you die or kite them with the slow from arcane orb + temporal flux, making use of venom hydras and seeker magic missiles at choke points. The damage bonus from force weapon is an awesome boost as well.
This is the build I use to solo Inferno and bosses, making sure I don't need to change anything and lose all my nephalem stacks. Oh, and don't even try progressing past act 2 without a >1k dps weapon and appropriate armor.http://us.battle.net/d3/en/calculator/wizard#acQRSO!dUf!cYYbZY