They say you shouldn't invest in things you don't understand. Now, I'm a little slow, so it took me a few tries and I had to learn the lesson personally, but I'm fully on-board with this.
If they're refusing to disclose stuff, such that I can't understand it, I wouldn't invest, period. I don't care if they've doubled everyone's money ten years in a row.
If they do disclose, such as with the patent filing, above, then I'd take a long, hard look at it. Is it likely they figured out something that no one else has? Probably not. So, as the saying goes, extraordinary claims require extraordinary evidence.
If they can logically show their method is better, great. If they're obfuscating things, it's a no go.
Sounds like they're just doing a complicated option strategy that is, in the long run, -EV versus the market average, due to the limited upside.
Do you feel comfortable enough understanding what's going on with your money to explain their strategy to someone, and explain why they should beat the market with that strategy?
Because I see two separate issues: it sounds like you aren't, and it sounds like they can't. Either one of those is enough to make me stay away.
But again, I've learned this lesson. This may be your time in the barrel. :)