TIDA-01457: derating at 85degC ambient for 12v->-2.5v

Hi team, 

In the datasheet of  tps82130 the thermal derating curves are available for common output voltages like 3.3, 1.8, 1.0.

However, my customer is curious to know these values if the chip is used as an inverter e.g for 12 Vin, -2.5v out? 

Following TIDA-01457, what kind of thermal derating should they expect at +85degC ambient?

Thanks, and looking forward to your response. 

Regards, 

Obinna.