If I understand correctly, it's not annualized solar but annualized thermal inertia (the ATI in WOFATI). It has to do with using an "umbrella" to make use of the earth's more constant temperature. http://paulwheaton12.wordpress.com/2012/11/28/passive-annual-heat-storage-2/ So it would be addressed later with the layers of poly/newspaper/etc.
Jesse, the "umbrella" is part of passive annualized solar. The naming variations just lend to confusion, when the same principles are applied using similar, or identical techniques.
Since so much of the mechanism for making it work is underground, it seems like something you do when you lay your foundation, not after you have structure in place that can be destabilized if you dig too close.