Here is the trade CML dude is referring to. This is the
Long delta 40, short 2x delta 30, short 1 delta 22, long 2x delta 15.
I do not see anything special about this.
If not delta hedged this is a directional trade, with a brutal risk reward. Even if you wanted to consider this as a short vol/skew trade, your gamma/vega ratio is a little high.....
Trade the underlying if you want delta.