This is not a good guide or build for beginners. The video is 2 years old and the forum post does not discuss the updates in his POB or passive tree and ascendancy changes. I can decipher what he’s doing, but I don’t expect a beginner to.
When I load the POB and see 7 jewel sockets with 5 rares, a spell-triggering weapon craft, and unexplained Elemental Equilibrium (he’s using a +fire ring and shield charge attack to trigger EE and boost the cold damage minions vs bosses), my alarm bells go off.
I’m not saying the build is bad, but it has very little in the way of damage mitigation or help for new players. The author claims it’s tanky, but his defensive strategy is to walk away and not get hit. This probably works fine for him, but not for you, because he’s played thousands of hours.
I would do it. The biggest links should be your primary damage. Downgrade the zombies if they’re less important.
Hatred is linked to Generosity so you don’t have to be near the minions. Skitterbots does not link to Generosity at all, and it reserves less mana than Hatred (35% vs 50%). The enlighten gem in the Skelemancer POB reduces mana reservation, which is why the auras are linked in the same setup together. A 50% aura makes it hard to reserve other things, but War Banner or Dread Banner might work.
Because you can’t reserve a defensive combination like Skitterbots + Discipline + Flesh and Stone, be sure you are getting defenses elsewhere. Something like CWDT + Enfeeble + Steelskin + Cold Snap is useful, but don’t level the gems too high. Keep the CWDT trigger around 1/2 - 1/3 of your life. Notice the minion jewels on the POB that make them blind and taunt.
Here’s a neat trick to get Fortify for caster builds with melee weapons: The Vigil jewel with General’s Cry linked to Vigilant Strike. The summons will strike and fortify your whole party.
Edit: The defensive ascendancy nodes are also worth considering, Bone Barrier in particular. I would take that from the 2nd or 3rd Lab if possible, or re-spec for it (ascendancy passive nodes cost 5 refund points).