It just shows you what happens when you write things in haste! The "walk-through" was written at the gallop, to meet a deadline, and as a result a few boo-boos crept in. The correct version is the one given in the rules, rather than the walk-through. I'll add it to my list of errata.
Oh, sorry for taking a while to reply. I was away promoting a book, and then my hard drive died, leaving me bereft of internet access!
Best Wishes,
Angus Konstam
www.edinburghwargames.com