The beauty of this strategy is that you don't need to build any military units, allowing you to put your resources into more useful things, such as colloseums and Coastal Fortresses.
I understand that some people prefer to be more purist, and try to beat Deity and Sid on a randomly generated map, but that is just their personal preference.
I hope my post contributed to giving people new and creative ways to beat Deity and Sid level AI.