I think the spelling mistake threw you off.
I did not tell him to put it in /root/.kde/AutoStart.
I told him to put it in /home/"username"/.kde/AutoStart. You are right but as a newbie he must be notified of the root path in case he does a search. If you read the note again it says to put the link in /home/"username"/.kde/AutoStart.
I never said I was or that he should log in as root (actually pretty hard on new linux dists as most require sudo and can not boot into root). Just telling him there are more than one folder that can have ,kde/AutoStart. Try chilling out. :-) :-)