When you do the math and look at what a 4 level, 30x30 grid ends up resolving to, it is an area of the earth approximately 49 meters square at the equator. Where I grew up, in a medium density American neighborhood, that would take in 4 separate residences. In a more densly populated area, even more. PLus this scheme does nothing to resolve the vertical component of an address for multi-story buildings.
Nice add for Dr. Shens business though.