Quote from BeatingtheSP500:
I don't know exactly what they were doing, so it's really speculation on my part. My guess is they were rolling the puts over every month, but not increasing the total equiv SPY deltas from the previous month. They may have maintained a constant 2% OTM strike.
Looking back on some others posts from the OP, it was stated there was a highish 200 contracts sold per $1mm, but now is at a 100 contract clip per $200, which still indicates some leverage.
And you are correct, that a 100% per year return absolutely reflects an unacceptable level of leverage. But don't equate selling naked with unacceptable risk.