Clearly the safest place to be in an earthquake is in the air.

But, I wonder if the woman's platform shown in the video was already on an air layer and not the "1/2 second after initiation of" the rocking.

I would be concerned with a few things: 1.  The air compressor must be attached to the house, not the ground.  It must survive the fraction of a second rocking before the house lifts off the ground.  2. It must run on a battery power since utility supplied power may fail during the earthquake.  3.  While half a second to detect and respond to an earthquake is realistic, I am not sure how long it would take to lift a house on a cushion of air.  That is a lot of rocking in between the system must survive.  4.  Lastly, how well will it work over a liquifactional surface during the earthquake?  Can it actually push against such a phenomenon?  And do cracks opening and closing below the house present another problematic phenomenon?

Escape disaster through the air is a novel idea. Terrorists practice this idea long before the Japanese began to even think about it. Airy government haters, whose feet do not touch the ground, attack and kill. Most of them escape the death penalty by claiming insanity.

Clearly, the safest place in murder is when the mind is in the air. Although in prison for life, Charles Manson who claims he floats in the air, is still alive. Ask someone who sounds familiar. He knows how this works.