This was the statement which I do not think is correct ...

"you can have perfect TOTAL toe-in with the tires turned 30 degrees"

Where did that concept come from ?

I think that when the tires are turned there is no way this can be true...... the geometry changes....by definition.. no measuring of them in a turned position would be legit.... because the distance between them changes according to the number of degrees the tires are turned.. and you can't roll it straight in order to get the tire set out of it....