Not the mod author, but I can tell you it's because you already completed Tatooine on that save. Basically, you can't modify a module after you've already visited it in a save (with very few exceptions).
But that being said: you can just use the cheat code "warp m19aa" to teleport to the start of the Tatooine temple, just past the entrance within the Krayt cave.
Have fun!
Thanks for the report! Turns out I missed some conditional scripts, but I’ve now re-added them to the archive. I’ve uploaded an updated version, and the changes are retroactive, even if you’ve already trained your companions.
Just pulled an update based on your reports. The issue has been fixed, please download the new version.