That is really bad advice.
AID is useless for softmod reinstallation. It makes all sorts of simplifying assumptions about the current softmod and disk layout that are often totally incorrect.
The easiest way is to use HeXEn (Google Heimdall's Xbox Engineering Disc), because it was designed specifically to fix softmods as well as rebuilding hardmod disks. Burn it to DVD-R at 4x or slower, cold boot with it, follow the instructions. It will install a new, clean softmod (either Kingroach NDURE 3.1 or Krayzie 1.1.1) with a couple of button presses, and it doesn't matter what state your current softmod is in - so long as you can boot a homebrew disc it will replace your current softmod with a new, complete one.