Season to season there have been some relatively big aero changes and there was a lot of discussion it impacted low rake designs like Mercedes and AM/RP more so than high rake designs like most of the rest of the grid. There wasn't anything in particular to this race that changed. This particular race was more a damage issue but even without that, Mercedes weren't going to be on par at Austria in all likelihood.
The tyres were a step softer too as well weren't they?