The stance in the books is primarily a "European" stance, where most of the weight is on the front leg. I think the book was written in Germany by a German.
This is different than the "American" stance that my AR coach taught me, where the weight is even on both legs.
IMHO neither is better, just different.
Like the title of one of the book "WAYS of the rifle." Note the plural wayS. The author discovered that there is no ONE WAY, there are MANY WAYS that work.