What do you mean, or what does Sosnoff mean, by systematic?
You cannot just sell volatility blindly. You have to make some kind of correct prediction about the direction of volatility or the direction of the underlying, or both. Yes, you can sell your straddles, flies, condors, or what have you on a regular basis. But selling them without any proper assessment of volatility will result in a net return of close to zero, if you look at it over time. The expected value of most options trades is zero. So you still need an edge.