Oh, wow… I wasn’t expecting that reply. I was actually looking to discuss in general how to address this variety of issue. It was a few years ago but I suppose the code could still be interesting. I dug this up:

dl.acm.org/doi/10.1145/2911988

And now that I dug back into this, I must make a correction. ACM replied to say they are looking for the missing material… then they never found it and they dropped the ball at that point and also neglected correct the description. AFAIK, ACM did not try to reach the researchers, who ignored my inquiries.