But easily countered if they had gone mass archer with a screen of warriors rather than phalanx (which are absolutely the worst non-ranged unit to send into that warrior spam, and would have been even worse had there been legion spam). Melee gets a bonus against anti-cav.
They played really badly. Units arrived piecemeal, they fought under the city walls (and archers) and attacked into rough terrain and across rivers rather than dealing with the enemy army in the open ground to the west. And of course they kept their adjacency bonus from coming into play by keeping their units apart. They seriously did everything wrong.... which doesn't show off the emperor difficulty at all (which was the point according to Ed in the last 2 minutes)
And doubled down on that by doing the stream wrong. If they wanted to show anything off, they should have set up the game on turn 25, and then started streaming. The first 50 minutes of a 60 minute stream were a complete waste of time, and displayed nothing. And the next 50 minutes (if the game had continued) wouldn't have shown off anything not shown in dozens of youtube videos and streams, so they could have focused on what the AI was doing.
No, that was bad. It suggests too many scouts, and not doing what the should be doing- exploring and getting goodie huts for bonuses and eurekas/inspirations. Scouts hovering around the cities to fight when there is a cloud of warriors is just a waste.
It's all ridiculous, because its spam all the way down, rather than a challenge. They're unwilling to learn anything or make real changes in this area despite this being a constant problem with the civ games (and BE).
Which is sad, because a lot of the other aspects of the game are better. I'm not sure why the most ubiquitous part of the game gets the most neglect.