According to the book, they were running a SR of 2 through the 90s and early 2000s. After overhauling their strategies, they started running a SR of around 7! I’m not sure where you can get information about other funds besides finding articles in BB or WSJ, but the HFRI Index publishes return information for different classes of funds. Regardless, I don’t think you’re going to be able to access SR unless you’re an investor or work at a portfolio analytics company.

idk about medallian but capacity-capped HFAT funds can be near zero risk. I remember one HFAT firm went public and their S1 filing revealed they had lost money on like 5 days out of 5 years. It's not really 'prediction' or 'investing' in the sense generally implied