i had a look at that site but am none the wiser on that particular technique other than it is by machine. first i've heard of wrongside applique.
i know reverse applique...rather than attaching the applique shape on top of the background, you layer a piece of fabric for the shape behind the background, cut out the shape from the background (remember it is on top), tuck the edges back underneath and stitch that edge of the background to the applique piece behind. i'm not sure how clear that is to you. here is a link to see how it works.
The Kuna Indians of San Blas Islands sew what is called Mola and is many layered reverse applique. it is beautiful. most of their work is rather detailed but i have seen simple designs done in this method as well.
a couple of links to this method.
http://blakesmarestudio.com/reverse.htm
http://www.flickr.com/photos/pananani/
nayy, just found those on google images, there are heaps more.
also somewhere online you can find some good instructions for doing the mola layering.
i feel a headache coming on or i'd go find it for you. sorry.
off to find some caffeine or herbs or something for this.
hope that helps,
j.