Thanks for pointing this out. There was in fact an error. I've fixed the error and updated the study. Some of the conclusions embedded in tables change; the final conclusions reported stay the same.
I've credited you on p.3 of the new version. If you want me to credit you by name, please let me know.
Thanks again!
From Geoff Anders of Leverage Research:
Not a surprising result, perhaps, but the details of how Geoff taught AGI danger and the reactions of his students are quite interesting.