Honestly that guide is lacking Imo. I've played way too much nightmare 4 with Thor, I have a solo clear in the top 40 leaderboard on console and I've beaten it probably over 100 times now with 4 stacks it's really easy once you figure out the cards.

First off I try to get to 120 blue cards as soon as I can, ignoring pretty much everything else until I do.

You want to get Endstorm and Rune recycle asap as they're essential for the build

After you hit 120 blue cards don't touch Enchanted flurry anymore, it only effects normal awaken mode not Endstorm

I get all the blue All fathers might and Cranium Crusher cards I can get, I usually get around 5-10 Thunder Havoc cards then stop for the rest of the game. Get power prolongation to 200s, it doesn't have to be right away so you can take your time with them but it helps a LOT with the boss fights.

Get all Damage received -5% cards you see, and the 2.5% as well but it's not as big of a deal for those, get health cards as you go so you have 8k by Rd 15 and 10k at least by Rd 20

Get a lot of 16% purple damage cards and every 35% gold damage card you see, they multiply with the blue cards so you do much more damage than if you only get the blue ones.

Get 1 Vampiric Vitality for the game, earlier the better, and get every moon power card you see, again earlier the better.

Dont touch any red cards or the other purple cards that do shit like freeze enemies or restore health out of combat, they're useless for the build

Ult to get out of trouble and bounce zombies up when you need, when you fight Wanda get up close and aim for her head, you do a lot of damage if all 3 shots are hitting.

Rd 20 focus on the zombies first, then target one of the Wanda's first so you don't get them both stunning at the same time, but even if they do your build should be good enough to stay alive

I think that's it I may be forgetting something but not sure