See you didn't look at the video of the software.
I or anyone with authority can create a ballot of any number of candidates in few minutes. Each ballot is a race. The webpage gives you an encrpyted receipt that if you submit back that hashed number, will return your ballot. When you vote, it goes to a counting app that shows part of your hash and what number vote you were. I built a good part of Wall street in the days, I know, you should ask instead of tell.