This guy was doing synthetic short naked options. He traded too big for his account size.
The small Delta he was short became large Delta with the market rally which is equivalent to a large position relative to his account size. Volatility is near all-time lows and his strategy was to sell volatility so no surprise. If selling naked puts in ratio spreads he would've at least had the vol skew in his favour but he did not do that. I'm a vol buyer so I'm grateful for these people to come along and try their luck.
The small Delta he was short became large Delta with the market rally which is equivalent to a large position relative to his account size. Volatility is near all-time lows and his strategy was to sell volatility so no surprise. If selling naked puts in ratio spreads he would've at least had the vol skew in his favour but he did not do that. I'm a vol buyer so I'm grateful for these people to come along and try their luck.