"He comments that ice might exist 400 miles from the poles. (Making it only 200 miles to the resources he mentions in the North Pole scenario.) Would 400 miles south of the North Pole be enough to get a view of Earth? "

Depends on topography. But on nearside of Moon, Earth is always in one direction, but goes up and down and sideways a little bit.

Earth of course appears bigger than the sun [Moon appears about same size the sun from Earth {though depends slightly upon the Moon's orbital distance from Earth}. The Moon's diameter is 3476 km. Earth's diameter is 12,756.3 km. So from the Moon the Earth appears about 3.6 times larger than the Sun. Basically anywhere on the nearside including up to north pole and even beyond to towards the farside you *could* see the Earth.

Generally if you are in a location in which the topography allows you to have constant sunlight and you are on the nearside you will also always have Earth in the sky [it will be near the horizon- though maybe at times a part of Earth is blocked by the horizon].

10 times more easily read..... Now, about that content...... :-P