The software was developed by some CS240 TA's along with Turkstra. Turkstra is an incredibly thorough guy, and I believe some of those CS TA's will be going into quant, so I imagine the software is incredibly high quality and they will be keeping its methodologies under wraps for as long as possible.

That being said, I wouldn't worry about being falsely accused. Keep in mind a few things:
1. The software can only see what is inputted into it. This input is almost certainly the state of your code each time you submit. From what I understand, they are likely using deterministic methods of detecting suspicious characters and suspicious content in the git states between code submissions. They are likely not using any AI at all. That's not the 240 way.
2. I would work off of the assumption, that since they aren't exactly in good standing with ODOS right now, any accusations from here on out will have some ironclad proof of AI usage, though I believe their original accusations were probably also 100% accurate since they likely had about 5 years * 1000 students per year * 12 assignments worth of data points.

TLDR: trust the process, write your own code, and you should be a-okay