I don't know, but I am doubtful that there is a quick and easy scheme, or generally that there is a strategy that can be learned in paid classes or with subscriptions or trading "clubs", that cannot be learned by reading free scientific papers and studies and by doing your own research. Not to mention how would someone be able to identify, evaluate, and measure risk, tail risks, and long-term expected performance and risk-adjusted returns of a strategy, without putting in the hard work and studying the subject deeply. I'm happy to stand corrected.
When I was trading, they seemed like they were ahead of the curve. Excellent traders. If the OP has access to any trading techniques, I would say it's worth learning. But as you say, it's unlikely they would be available to the general public. I was told that back in the day, they didn't hedge any of their option trades they made. They felt if they had an edge in the long run, it would work out. I always found this hard to believe, but that was the rumor.
I was an independent MM. I had no interest is working for a large MM firm. If SIG were to hire me, I would have jumped at it. I never would have interested them even with my BS-MBA from NYU. They hired either from Ivy league schools or top poker players. I'm also not that good at math and would not have met their requirements. They traded larger than most in the crowed, often larger than the specialist. Their policy at the time was not to trade stock pre or post market. They did not always hedge until near the close. It was up to the trader. I remember one time, a broker came in and asked for a spread market. We all made one. The broker asked how big, the SIG said "bigger than you."
They hire also chess grandmaster. https://www.linkedin.com/in/andrew-tang-b7a113175/ Watch one of the videos where this guy is playing bullet chess. It is wort it!
KrisA is a former SIG trader who shares plenty of trdaing insights and currently building tools for retail option traders @KrisAbdelmessih https://moontower.substack.com/ https://www.moontower.ai/ https://blog.moontower.ai/
This: Take it to heart, it is priceless. And his advice is free. Let me add one more: The market also has an opinion and is in the option price. You profit when your opinion is significantly different.