It would be interesting to compare term structure (front month / back month) before and after earnings. It could be a bet on the slope of the term structure: short strangle front month and buy strangle back month.
Could you explain how this position would make money? I understand you're effectively short vol for the near dated expirations and long vol for the further dated ones. So are you expecting the IV crush following the earnings release to increase the slope of the term structure?