This build is a lot like the LoN DH or the crusader. You want to maximize a very short period of damage.
It's a cold damage build because of Black hole Absolute zero.
You basicly make a big pack during your first archon rotation (you're more tanky & projectile slow) by pulling everything with laser.
When first Archon fade you do this :
-Stand right in the middle of the pack to proc Ancients Parthan & Halo of Arlyse damage reduction. (Blach hole also works as a "stun").
-Stack up tals buffs & chantodo with Explosive blast.
-Watch for the arcane element from CoE.
-Make a huge Black Hole with as many monsters as you can stuck in it to proc insane amount of frost damage.
-Pop Archon right before frost comes from CoE.
-Stand into the zone from Occulus.
Regarding how to survive :
What you don't see in the vid is the fishing for this kind of rift. It's extermly hard to deal with most of the mob type (he is very lucky to find this conduit because the last mob type he encouters is atrocious for a Wiz).
What you can see is when he tries to finish the elite pack near the portal for lvl 3, he cannot do it because there's not enough monsters frozen around him to survive, so he goes back a liltle, pick up a pack with melee mobs, wait for the 2nd archon to kill the last 5% of the elite Ghost.
It's a good build, but it's hard to play, you also need a very specific amount of CDR, and the fishing is insane.