I don't see anything arch specific in the kickstart setup. The option to point to repos would probably rely on the variables like release $releasever and $basearch, so if your using that option I would just check to see if they are set correctly.
This is coming from someone who has just read up on kickstart, but who has never used it, so, just far warning.
This link may be helpful:
Yes, it appeared to me that the section on repos was the same in the kickstart files and dependent on the values of the variables.
However I was not able to figure out when/how the variables are set. So I created a "test" image using the desktop kickstart (unmodified) and monitored the output which looks something like
And this shows the correct values for the variables. So i will copy my custom kickstart files over and give it a shot.I will also review the link you provided as it looks informative
Thanks for the reply