Lol i truly don't remember from where I had the idea
Prob from his video yeah
But i've honestly been imrpessed on how well that actually works
Though i haven't looked at his videos for a while, looter & zarfen are by far better streamers
mrllama isn't very strong on the creative side haha
He certainly loves the game and reads a lot about it online, but the ideas he promotes come from thinkers, not from d2 influencers

I explained this phenomenon on post #12 here
I'm not gonna claim that I'm the creator of this build, been promoting it for years but someone certainly had the idea before me.
I was a bit off about the 50k dps tho, I did the full calc and it's 55k dps against p8 TZ 96 diablo
Not bad considering that you only deal 11k psn nova dps
He kills diablo in ~7 seconds alone
If I support him with psn nova and merc it takes ~6 seconds
If I used the sub-optimal infinity merc + IG it takes ~16-22 seconds (varies based on luck factor for CB dmg)
The faster boss kill time is only a very small part of why thorn insight merc + fire golem is so much better than anything else.
For general density destroying I get more than 20% better xp/min when I stop wasting time with CE
CE's dmg is so low on p8, you lose so much total dps instead of just flying around and applying your psn nova to way more mobs than just waiting there for a kill form your merc to then cast amp and then cast CE a few times.
The difference in playstyle is not even close in terms of clear speed.
I even still see people suggesting to use fire/phys sunder, to try to make CE a bit more relevant.
Not only you get 2 or even 3 -70 res malus, making this squishy build even more fragile, but you also lose PnB skillers, slowing your clear speed even further.
And like I explained, Fire Golem's priority aggro is help the build a lot defense-wise.
Seeing all these posts about infinity, IG and CE explains why all those people also say that necros suck on p8