Walkthroughs for custom maps.

Something vaguely familiar. At first, I thought it was one of the standard maps. Turns out, it's an author's creation by Kirinyale, here it is. I haven't played it, but I downloaded it at some point.
So, what's the deal with it? Let's take a closer look.

This map seems to be designed around the idea that you spend about four months building up your army and then, with significant losses, defeat hordes of enemies. So, would it make sense to edit it for a faster playthrough? That is, reduce the number of troops, say, by a factor of four (considering that in the final battle, the enemy has 3200 goblins and a corresponding number of other creatures, and the map starts with a regular hero)?