Exactly. He has made this broken ass wheel kind of roll. To true the wheel properly it needs a complete rebuild, but he has worked wonders with what he has to work with. The CAI is pretty much awful in vanilla. I've dropped over 200 hours into the game now, several games beyond 200 turns (I'm straight up sandboxing to see how the AI behaves). You're exactly right. The vanilla CAI is just garbage. Outside of the first 20-30 turns when everything is sensible, the game degenerates to the point where the AI will rarely if ever fight for settlements.
For example in my last game which I pushed to 230 or so turns, I was playing as the Jutes. I migrated to Carthage and North Africa pretty quickly. Gaul formed, expanded rapidly to around 25 settlements, but the collapsed due to the Huns/everyone ganging up on them. Out of these ashes rose the Danes. By the time I pulled the plug on the game they were the number 1 power, had around 20 settlements. All of Spain and some of Gaul. Eventually I ended up at war with them. Guess where they had 10-15 full stacks. In Spain? Nope. In Gaul? Nope. Italy? Nope. Sarmatia. They are in Sarmatia chasing the Huns around. 10 to 15 stacks of Danes on the opposite side of the map, where they had ZERO strategic interests, chasing the Huns around. In total they had around 20-25 stacks, I had about 7 full stacks + about 6 more garrison armies with 3 or 4 slingers in each stack. If the AI had any clue at all, it would have bum rushed me and killed me in 3 turns.