Don't be so down on this idea -- it's quite plausible and works very well in 'tempered' markets.
On average, if you are truly patient and follow a good system, you should net 50-100%/year doing a calendar spread on minimal effort (3-4 trades per month depending on the weekly action). Covered calls do well, too but spreads are a bit nicer because you juice your leverage by taking long calls vs. long stock.
So, why would someone bother running a business doing this? Because it takes minimal effort to juice their own return AND, the bad thing to spreads, the occasional massive drawdown. This helps them through the rough times.
I don't know this firm but it's a completely valid strategy.