the defender perimeter in the lost plateau map is not well drawn. as such you can use stalk units with forward placement like cameleon to deploy inside the greenskin city and take the capture point without the AI realising what is going on.

usually on vanilla maps the AI will put flying units and often his lord on the capture point so this scenario is unlikelly to happen even with stalk unit climbing walls from a safe distance from the defenders. here the AI does not for some reasons. even their artillery they use to put near the capture point is just behind walls for some reasons.

the dwarf variant has the same problem.