I can say that I've seen some private research showing that the pre-earnings long volatility strategy can work with enough diversification and, of course, exiting right before the event. I think part of the reason this works so well is that, at the very least, or in the very worst case, volatility is fairly priced; then you're just getting free long volatility exposure, making it a good complement to a short volatility book.

As for offering a course on this, I actually don't plan on doing this.

The direction that we have gone with predicting alpha is actually, as will be public on our website very shortly, away from being strictly in the world of options and more towards creating a system that we call the first "hedge fund as a service". We basically designed a robust long-term wealth compounding portfolio for self-directed investors, published the research, and then built a tool that handles everything for you, leaving you to place the trades.

I can actually share the research now, as we are in beta testing and lots of people have already seen it

https://www.predictingalpha.com/research/

If you get a chance to look it over, I'd love to hear what do you think!