Don't believe everything you read by these ai beaters they just want the ai ramped up so they exaggerate. Notice they don't tell how many ai opponents they used or that they moved up to ridiculous level and won so easily.
I just started one on a medium map with 9 ai opponents with map level at hard and 1 ai opponent on extreme and 1 ai opponent at ridiculous and it certainly wasn't easy. I actually got hit by bandits and a group of 4 spiderlings right off the bat after settling my first city and they killed my first pioneer as well.
They also don't tell you how many reloads they used in that process as well. Anyone can beat the ai by reloading save games until you get the output you wanted in a battle.
It doesn't take much to beat the AI at all... Here's an easy to exploit abuse strat (which really shouldn't exist).
Large map, ridiculous, 6 enemy AIs.
1. A custom leader that has adventurer/organized/tracker has a base 4.0 movement and makes his whole team move at that speed.
On first turn, build a town, buy the leader the 1.0 movement boots. That's 5.0 movement right there.
Eventually, if you buy the leader a 100 gold horse/warg, that's 6 movement.
2. I was using a great warrior/bow tech custom faction.
This gives you longbows off the bat (tech is buggy. I believe it's only supposed to give shortbows, but it gives you longbows too.
So right from the start, you can train ranged 7.0attack units.
Research party, now you can train 28 attack ranged parties if you wish.
Almost, great warrior increases combat movement by 1.0. So bowmen have a 3.0 base movement, meaning they can shoot twice per turn.
3. Exploration is everything. It'll find you the best places to settle (gold mines & materials get top priority, then lost libararies).
Also, the random resources on the map help you a lot, as does finding creatures to fight and kill (which gives you a goodly amount of gold for training more units).
Turn 93 before I got completely bored, my army consisted of my leader, a fire elemental, a familiar, a party of 4 axemen (28/28, 66hp), 2 parties of bowmen (28/0 66hp and 28/24 66hp), and 4 single bowmen units (7/0 assorted hp).
Destroyed 3 factions so far.
10.9 guildar, 11 materials, 2 metals income per turn.