OK now its morning and I've just re-read my original post from yesterday.
After sleeping on this idea--would this technique really make strips that are on the bias the entire length or would only the end portions be bias?
If you visualize each strip as having 3 sections----(#1 and #2) ends that will have been cut from the folded over corners and (#3)the middle length of each strip that will have been cut from the back of the folded square.
I mean wouldn't #3 still be on either straight or cross-grain?
Diane Aholt nor Marianne Fons mentioned anything about this on the show so I could be wayyy wrong. They said "it makes bias strips" so I assumed they meant the entire length of each strip would be on the bias.
Maybe I'm not awake yet and shouldn't post this till I actually try it but I don't have time today. I'm going into work 2 hrs early.
I hope someone (who has more logic than I) can answer this.
BTW the Fons and Porter episode I saw this on was #1802.