Yes, only the SCFA game updater/switcher uses AutoIt. It's not used in the game, as everything is written in lua. AutoIt is a scripting language that has some very powerful programming capabilities, especially for file checking and manipulation, and I wrote the updater program in AutoIt.
You can download the AutoIt programming language, and the SciTE editor that it uses here:
https://www.autoitscript.com/site/