Thin film resistors & power derating curve
If you go strictly by the datasheet, then no, you can't go there.  That derating curve is clearly designed with the notion that the resistor shouldn't operate above 155 C for extended periods of time.
So it's up to you to either find another resistor, or accept that you're gone off the rails as far as Panasonic is concerned, and it's up to you to figure out what the resistor actually does at elevated temperatures, and whether that behavior will be acceptable.